What about these anyone have any info on Them the coins on the top one is silver and the other one is gold why is that
They're Japanese yen. The difference in color on the 500 yen is due to a metal change. https://en.wikipedia.org/wiki/500_yen_coin
50 and 500 Yen from Japan. They have a decent face value, each ¥500 is worth $5.00 USD. They are currently spendable there so there is no added collector value except if it's a proof.
They are ALL Japanese yen. The ones with holes and that say "50" on them...are worth 50 yen...According to xe.com, 50 yen is worth about 48 cents.
Depends on the country. In many countries obsolete coin types are more valuable on average than currently circulating types. But there are immense quantities of obsolete types with no significant collector's value. If you post pictures, you can get a more specific response. But in most cases expect to be disappointed on resale value.