Quote:
You seem to be overlooking the Japanese Lottery Postal Card program
Not overlooking, just my memory chip was corrupted

But well spotted
recall suggests New Zealand as well with her "scratchy" issue.
Albeit, is that true gambling?
If you buy a stamp for postage, and you win by accident, maybe that's a free gift ?
Running through my database,
we have Benin Lottery Sc#C263 1977
Estonia Lottery Stamp 1999 3.10 + 1,90
South Africa SG#ZA1168 Standard Postage Lottery
China : Lottery Postcards 1982-1992
Lottery: A tax on people whom are bad at math