Help to identify coins / Aide à identifier les pièces de monnaie

Bonjour les amis, encore une fois besoin de votre aide pour identifier le KM #, date (année) et le pays d'origine de ces pièces. S'il vous plaît aidez-moi beaucoup ont essayé avant, et signalé que le pays et KM #, j'ai beaucoup de difficulté à identifier l'année (date), alors s'il vous plaît me demander de passer des informations complètes. Merci pour votre aide!

Hello friends, once again need your help to identify the KM #, date (year) and country of origin of these coins. Please help me many have tried before, and reported only the country and KM #, I have great difficulty in identifying the year (date), then please ask me to pass complete information. Thank you for your help!  

M. Olivetti

https://en.numista.com/catalogue/pieces15928.html

https://en.numista.com/catalogue/pieces7515.html
https://en.numista.com/catalogue/pieces922.html
https://en.numista.com/catalogue/pieces3047.html

https://en.numista.com/catalogue/pieces983.html

Coin 1 =  Oman  10 Baisa   2008 (1429)
Coin 2 =  Japan  10 Yen  (cannot see date clearly)
 1951-1958  or  1959-1989  or  1989-2009
Coin 3 =  Japan  1 Yen  (cannot see date clearly) 1989-2009

Cita: ZacUKhttps://en.numista.com/catalogue/pieces15928.html

https://en.numista.com/catalogue/pieces7515.html
https://en.numista.com/catalogue/pieces922.html
https://en.numista.com/catalogue/pieces3047.html

https://en.numista.com/catalogue/pieces983.html

What are the dates?

You wrote that while I was still adding typing my reply. Your pictures are not clear enough to tell dates. I have shown you the pages; so you have the coins and can look for the dates there yourself. A thank you would be nice ! Luckily you are my friend  

Cita: ZacUKYou wrote that while I was still adding typing my reply. Your pictures are not clear enough to tell dates. I have shown you the pages, so you have the coins and can look for the dates there yourself. A thank you would be nice ! Luckily you are my friend  

  I appreciate your attempt to help!

Olivetti

https://en.numista.com/numisdoc/calendar-japanese-34.html

 My computer does not display Japanese/Chinese characters (and some others), as I mentioned a while ago on a different Topic. I get boxes with numbers in, like on the right in this picture. But the above converter can help you, unless the pages show correctly on your screen.

 Maybe (as not sure of your last three coins as picture is too small) coin 4 is 1993 date ? I can see symbols on yours which may be the same as those on a coin of mine also. Here is a picture of mine in close-up, and an explanation of how to work out the dates.
  I also have coins like 2 and 3 and will do the same with those  

 Looking at your coins 2 and 3 the Emperor does not appear (again as hard to see) to be Akihito like on coin 4, and are more like Hirohito. Which is another coin I also have, luckily; so again I can show below how mine is dated (1983) - so all you need to do is look up the numbers on yours and add to 1925.
  The reason for my typing 1925 and not 1926 is for ease of calculation; as 1926 is the first year (as there is no year 0) then it is year 1, and so 1927 is year 2 and so on. Which 1927 minus 2 is 1925 - or the other way round is if a coin has year 2 on it then add that number to 1925 to get the date.
  It took me a while to understand !

Cita: ZacUKhttps://en.numista.com/numisdoc/calendar-japanese-34.html

 My computer does not display Japanese/Chinese characters (and some others), as I mentioned a while ago on a different Topic. I get boxes with numbers in, like on the right in this picture. But the above converter can help you, unless the pages show correctly on your screen.

Thank you for detailed explanations were very helpful, greetings!

Olivetti

Cita: ZacUKLooking at your coins 2 and 3 the Emperor does not appear (again as hard to see) to be Akihito like on coin 4, and are more like Hirohito. Which is another coin I also have, luckily; so again I can show below how mine is dated (1983) - so all you need to do is look up the numbers on yours and add to 1925.
  The reason for my typing 1925 and not 1926 is for ease of calculation; as 1926 is the first year (as there is no year 0) then it is year 1, and so 1927 is year 2 and so on. Which 1927 minus 2 is 1925 - or the other way round is if a coin has year 2 on it then add that number to 1925 to get the date.
  It took me a while to understand !

Thank you for detailed explanations were very helpful, greetings!

Olivetti