Japan Today

Why the 50-yen coin has a hole and other fun facts about Japanese coins


A fun way to get a perspective on another country’s history and culture is by looking at the currency used. The materials and design that go into making them can say a lot about what a country holds dear.

So, why don’t we take a quick look through the modern coins used in Japan and learn a little about why they look the way they do and some other tidbits along the way such as what happens when you microwave a one-yen coin and why you shouldn’t do it.

Let’s start with those beloved little bits of pocket ballast: the one-yen coin.

Diameter: 20mm Weight: 1g 100% Aluminum

For Japanese coins, “heads” and “tails” aren’t easily understood. Although it’s not a hard and fast rule, most people seem to say that the side with the large number and/or the year printed is tails. In the case of the one-yen coin, heads shows us a picture of a young tree. The artist who created it apparently told a priest which tree it was based on, but he later admitted it was a lie and he just imagined it.

Like many small currencies of its type, the one-yen coin costs more to make than it’s actually worth. The amount of aluminum used alone is worth 0.7 yen, so after including all the other overhead you’re looking at about 2 yen a coin to produce.

The pure aluminum used gives this coin some unique properties too. First, it might be the only coin that floats on water. Actually if you were to toss the coin or push it down with your finger it would easily sink. The density of the coin is not buoyant, but its light weight allows the surface tension of the water to hold it up.

In addition, if you were to put a one-yen coin in a microwave, it would get all squishy. We would try it, but it’s a violation of the Monetary Damage Control Act and punishable by up to a year in prison or 200,000 yen fine.

The five-yen coin

Diameter: 22mm (hole = 4mm) Weight: 3.75g 60-70% Copper; 40-30% Zinc

This coin has a distinctive yellow coloring that’s made from the high content of zinc it possesses. This material combined with the widespread use of the coin provided a stable and easy way for researchers to measure radiation dosages indoors and out of all areas during the 1999 nuclear accident in Tokaimura.

Aside from its bright hues, this coin has a whole bunch of optimistic symbolism packed into it. On the heads side we can see horizontal lines representing water, from which a rice plant is emerging. Also around the hole (which we’ll get to later) are gear teeth. These symbolize Japanese agriculture, fisheries and industry.

On the tails side there is also a pair of sprouts which is said to symbolize Japan’s growth into a democratic nation. Even the name in Japanese (go en) is synonymous with good connections and this coin is the first choice for making a wish at shrines or kept in a wallet for luck.

The 10-yen coin

Diameter: 23.5mm Weight: 4.5g 95% Copper; 3 to 4% Zinc; 1 to 2% Tin

With its high amount of copper, the 10-yen coin is probably the ugliest of the bunch. However, it may also be the most profitable. If you were to have 100,000 of these coins in your possession it would be worth roughly (depending on the dealer) 1,005,400 yen versus their 1,000,000 yen face value.

Depending on the year of the coin, they can be valued from 10 to 20 yen a piece. The most valuable one is a Giza 10 (Jagged 10) from the year Showa 33 (1958). This was the last year such a coin was made with a jagged edge, and since it was the last year the fewest were issued, making the Giza 10 the rarest of them all and worth about 50 yen.

Prior to the late 1950s, the 10-yen coin was the most valuable, so a jagged edge was added to help distinguish it from other coins. Later on, when the 50- and 100-yen coins came out, the jagged edges were passed onto them.

The 50-yen coin

Diameter: 21mm (hole = 4mm) Weight: 4g 75% Copper; 25% Nickel

Like the five-yen coin, the 50-yen coin can be easily distinguished by the hole in the center. This wasn’t always the case though. Japan figured it could kill three birds with one hole. First, it helps to save on material costs. Secondly, it makes them more difficult to counterfeit. Finally, it helps people tell them apart more easily, even simply by touch. It’s said that the five-yen coin was primarily given a hole to save materials following the war when rapid inflation was occurring.

On the other hand, the 50-yen coin was given a hole because for the first couple years of its non-perforated existence, it was annoyingly similar to a 100-yen coin. As the two coins became even more similar over the years in terms of material and images (the 50-yen coin has a chrysanthemum whereas the 100-yen coin has a sakura), that little hole has become even more important.

The 100-yen coin

Diameter: 22.6mm Weight: 4.8g 75% Copper; 25% Nickel

The 100-yen coins has changed a few times over the years. The heads image went from an Asian phoenix to a rice plant to a cherry blossom. The material also went from a silver, copper and zinc alloy to a mix of copper and nickel. However, through all of this the size and weight of the coin hasn’t changed in the slightest since it was first issued.

The 100-yen coin was also Japan’s first commemorative coin issued in 1964 to celebrate the Tokyo Olympics.

The 500-yen coin

Diameter: 26.5mm Weight: 7g 72% Copper; 20% Nickel; 8% Zinc

The 500-yen coin is the newest coin in Japan and potentially the most valuable standard currency coin in the world depending on foreign exchange rates (the Swiss five-franc coin is one of its biggest rivals).

The 500-yen coin is also special in that it has tiny letters hidden throughout the tails side, spelling N-I-P-P-O-N in 0.2mm letters.

Source: Naver Matome, Okane to Kitte no Tenjishitsu

Read more stories from RocketNews24. -- Elementary School Child’s Design Chosen For Japanese Commemorative Coin -- 10 Yen Coin Takes Out Entire Shinkansen Train -- In Search of Osaka’s 11 Cent Vending Machine

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0 ( +1 / -1 )

I'm surprised the author didn't go into the reason for the colour change of the 500 yen coin. If you can find an old one (mid-shouwa) they're actually silver-coloured. The reason for the change in colour was (as with the 1 yen) the cost of materials.

1 ( +2 / -1 )

When I firs arrived in Japan I was told "We have money with holes in it !" (As if it was the only country in the world which such coins...) Denmark has always had coins with holes in them probably before Japan even thought about it !

1 ( +3 / -2 )

Another item not mentioned is a bit back that the 500 won (Korean coin) could of been used to fool Japanese vending machines in the past as a 500yen coin. The 500won coin was obviously a lower denomination, which led to a change in the 500yen coin and machines.

3 ( +3 / -0 )

1,478 yen. C'mon, you know you counted it too !

3 ( +3 / -0 )

That Byodo-In is represented on the 10 yen coin is apparently lost on the author...

3 ( +4 / -1 )

I’ m Japanese but I didn’t know that. I think the 5-yen coins look like Recently, Giza 10 tends to trade at high prices because it is very rare. Sometimes the 5-yen coins and the 50-yen coins also tend to trade at high prices. The 5- yen coins and the 50-yen coin’s hole very rarely have out of position. I think it is very interesting because sometimes coins have more valuable than itself.

1 ( +1 / -0 )

Interesting. For the life of me, I couldn't find those letters on the reverse of the 500 yen coin. Now, I'm pretty sure they are to the left of the dating? (I see six tiny bumps but cannot tell if it says "Nippon" with my eyes alone...) I like the shaded "500 en" grafted inside the zeroes, though. Pretty saavy stuff for a coin!

-1 ( +0 / -1 )

And here's another thing. Add them all up and they come to 666. You see, the Devil is in the detail.

4 ( +4 / -0 )

Serrated edges along with the raised area on the edge of a coin face are remnants from when coins had intrinsic value; i.e., when they were made from precious metals. These configurations made it impossible to shave pieces from the edges of coins and are visible on coins as old as the Roman era.

I love the 500 yen coin and find it amazing that the largest common coin in circulation in the US is the quarter - 25¢! (Had to Google for the ¢ symbol.) Americans just don't seem to keen to adopt the dollar coin, which is too bad as it would save the Treasury millions annually.

0 ( +0 / -0 )

The Phoenix Hall on the reverse of the 10 yen coin is rumoured not be from Byodo-in. The story is that the engraver at the mint was given an intaglio of an almost identical Phoenix Hall but it was not the one in Uji. The artist is reported to have used the Houou-in from Muryokou-in in Hiraizumi as the model for the coin.

2 ( +2 / -0 )

FightingVikingDec. 01, 2013 - 06:40PM JST

When I firs arrived in Japan I was told "We have money with holes in it !" (As if it was the only country in the world which such coins...) Denmark has always had coins with holes in them probably before Japan even thought about it !

While I agree boasting a hole in a coin is annoying, Japanese holed coins date back to year 708, influenced by Chinese coins. http://en.wikipedia.org/wiki/Wad%C5%8Dkaichin

1 ( +1 / -0 )

Quite interesting. I have been collecting (well, I don't spend them if I find them) 10 yen coins for the past ten years and have 520 yen worth, but I only have two of the Showa 33. I really like the font on the old 5 yen coins, and like how they used the old kanji for 国(國) I wish all the coins used a kaisho type font instead of gothic. The floating 1 yen coin is also quite cool because many Japanese people I mention it to don't believe me until I show them. It also makes for a really nice photo if you have a macro lens.

0 ( +0 / -0 )

The 5-yen coin makes a very handy washer in a pinch, and costs about half as much as the same size steel washer at DIY stores.They can be a nice decorative touch on DIY projects. I'll probably be busted for admitting I've used some in this way.

0 ( +0 / -0 )

That's all pretty interesting really.

0 ( +0 / -0 )

2 ( +2 / -0 )

Taking those pesky 1-Yen coins out with the beer cans for recycling every fortnight is becoming tiresome. Time to ditch these useless things and save the taxpayers!

0 ( +0 / -0 )

Cleo-san - thank you! Figured out what to get my nieces and nephews for Christmas!

0 ( +0 / -0 )

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