I'm more sure about the latvian origin, cogwheel, hammer and scythe are all on the coat-of-arms of the LSPR. But the datation is problematic, I found the order a bit too sophisticated and traditional for the 1918-19 period. I think that the LSPR was ressurected for a short time at the beginning of the soviet occupation in 1940, for me it's a better date for this design.
I found the comparison with the LSPR coat-of-arms quite convincing.
I found the comparison with the LSPR coat-of-arms quite convincing.












