The top one is clearly a Buffalo nickel and the bottom one going into the "bank" is an indian head cent. I can't make out for sure what the middle one is supposed to be, but I think it is a Barber dime.
Hello davidh! The first stamp (Credit Union) text: " E pluribus unum" = Liberty head coin!! I have about 3000 stamps with show coins and banknotes!
kovasti, The motto, "E Pluribus Unum", is one of the national mottos of the United States and appears on all current coins. It is a Latin phrase which means, "Out of Many, One" and refers to the beginnings of the United States which was formed as an entity out of the original thirteen British colonies. The coin depicted on the Credit Union stamp is not any particular U.S coin, and doesn't even resemble any current or past coin's design. Although this is primarily a coin forum, your collection of coins on stamps certainly qualifies as a subject of interest to us. Feel free to post pictures of your collection.
I bought some sheets of these at face a few years ago, and am still slowly but surely using them for makeup postage.