There are many Snow varieties for the 3 dates that you have(1859-6,1863-15, 1902-18). Most are minor varieties, However, the 1859 Snow-1, full repunched date, is a rare and important variety. I don't see any varieties with your coins, but many varieties are very subtle RPD and MPD and require better pictures to detect. If you are really interested in Snow varieties I suggest that you invest in his attribution guides
These grades are my best guess, but they could change with clearer and larger photos.
1859-VF 20
1863-AU 55
1902-MS-63