What is this game?

Aprox 8x12 Maroon leather case. Includes Greek plastic money and playing cards from 1960's. My mom gave me this before she died. She and Dad got it in Greece in the late 60's when they visited Athens and surrounding areas. I think it's a poker game but with cards of Greek currency instead of poker chips. It has two sets of playing cards in there just like a poker set would have. The cards have ships on the ocean on them (2 dif types of schooners). Each card varies in size and has different money denominations on them. All of them appear to be authentic reproductions of Greek money from that time. I am wondering what this really is (game, just a money reproduction for kids? etc). I think it must be poker because the maroon case has three gold playing cards fanned out on it. I've never seen anything like it and cannot find anything on google, ebay, this site, etc. I love poker and just want to know what it is exactly and how to play it!! (and I guess how much it's worth would be cool to know too). Thanks so much for your help!!