Correct. All from Japan. https://en.m.wikipedia.org/wiki/Date_and_time_notation_in_Japan Google numista for a coin site to learn more about them. You can simply search japan and look at the newer stuff. Those are relatively current.
This site will teach you how to read Japanese and Chinese dates and coin denominations. World Coin Collecting: Reading Japanese Numbers and Datesportlandcoins.blogspot.com/2012/11/reading-japanese-numbers-and-dates.html Welcome to Coin Talk !!
Yes, these are all modern Japanese coins and in their circulated condition they don't have much value, but they are cool coins anyway. Top coin: 100 Yen (百円), Showa 50 (昭和50年) or 1975 Botttom Left: 10 Yen (十円), Showa 27 (昭和二十七年) or 1952 - Type I milled edge Bottom Right: 50 Yen (五十円), Showa 43 (昭和43年) or 1968 The 日本国 on each coin stands for Japan, or "Nihonkoku" or "Nipponkoku" as Japan refers to itself.
Your so awesomeness thank you yes indeed very cool coins thanks for the help really appreciate all the help