Subject line changed for improved future Search.
We all have those mystery stamps awaiting identification. This one was filed in Russia for a while

Then yesterday, in a kiloware box I am working on, another similar one popped up

Still no ID but by random serendipity, I had another stamp from Latvia and there at the end of the (Scott) Latvia listing is the note that
"Eight typographed stamps of this design were prepared in 1919, but never placed in use. They exist both perforated and imperforate. Reprints and counterfeits exist"
Note the differences in printing on these two examples - frame around denomination for example.
All part of the terrible convulsions at the end of WWI in that part of the world.. So I have 2 of the 8 so far and look to find more. Strangely, the Latvian sites - very few of them - seem to ignore these (because they were unissued presumably).