I have been sent a scan of a stamp from a modern pack of
playing-cards imported into Korea.
This stamp was in use in South Korea until recently.
The text says that it is a stamp for certificate no. 1 for alcohol and Hanafuda.
There is a similar stamp for certificate no. 2 for coffee and cocoa.
(scanned by Ulrich Knüpfer, explanation by Lim se hwan)