Let's reverse the numbers at the end of the date, and make it 1917.
Exact match first.
1917 Finland 1 penni - civil war coinage.

After 1 hour, any Finland 1917 coin - civil war coinage.
After 2 hours, any Finland 1917 coin - not civil war coinage
After 3 hours, any Finland 1 penni
After 4 hours, any Finland coin
After 5 hours, any Scandinavian coin
After 6 hours, any coin from Europe
After 7 hours, any coin