Japanese 10 yen is correct, though there are a few different variants of very similar looking coins -- https://en.numista.com/catalogue/pieces3047.html https://en.numista.com/catalogue/pieces922.html https://en.numista.com/catalogue/pieces7515.html https://en.numista.com/catalogue/pieces182976.html If you pay close attention to the lettering on the reverse, you should be able to narrow this down. I believe you've got this one: https://en.numista.com/catalogue/pieces922.html Edit - alternative angle of the reverse would better help nail down the year. Also, based on your image, it looks like your coin has a smooth edge. Can you confirm it's smooth and not reeded?
Most of the variants are just different emperors. The reeded ones are slightly more valuable on average and were made in the early years of the series (Showa 26-33 = 1951-1988) Before wartime inflation, 10 yen was a lot of money, so the type isn't too old. If you don't read characters, here's a summary: 昭和 = Hirohito/Showa Era. Regnal year adds to 1925 平成 = Akihito/Heisei Era. Regal year adds to 1988 令 和 = Naruhito/Reiwa Era. Regnal year adds to 2018 Below L: Smooth edges Below R: Reeded edges of earlier Showa Era only
I wouldn't technically refer to the different Emperors as "variants" because they're really just different dates. That's similar to calling 1930 and 1940 Lincoln cents "variants." The main variants in this series are the milled versus the reeded edge, already pointed out, and a few really minor differences in the temple stairs and towers that occurred in the late 1980s, but they don't appear to add much, if any, value. And that's correct, the date on the coin above is 昭和五十八年 or Showa 58 or 1983. It's pronounced roughly "Showa go juu hachi nen." Sadly, that coin has seen better days. The 10 Yen still circulates in Japan, and you could spend it there for 10 Yen, which is equivalent to about $0.093 US at this moment. Given its condition, the coin posted has no additional value beyond that. If you're curious, here are the other characters on the coin: 日本国 = "nihon koku" or "The Country of Japan" or just "Japan" 十円 = "Juu 'En" or "Ten Yen" - Japanese coins tend not to use the "¥" symbol, but you'll see this symbol even in Japan, coins and bills almost always use "円"
