There are lots of silver coins of Latvia before WWII available on the markets currently. Reason is that most of them were buried and hidden by people around 1939. In such amount that in 1940 Latvian government event released paper banknotes of 5 lats, as all silver coins, which were default for that amount (there were no paper banknotes below 10 lats before), were out of circulation.

Gresham's law.