I see where the 3 cent coin comes in but it is more of shield shape, flat on the back and rounded on the front. As for the date you are right probably. I used to see 1505 but the more I looked the more it looked I saw 1907.1505 is way to early. Probably a button but its small. Ill keep looking. There are 2 dates and it is 0008-1905. The diameter is about 8 mm.