I can't remember if the yo marking has been discussed before or not and my search of the forums came up empty. Picture below of a 1933 Tula M91/30 with the yo mark above the arsenal logo. I assume this is an unknown marking? Has it been seen before? I'm debating whether or not to buy it as the yo is the only thing of interest to me about this particular rifle. The price is $125 and the rifle has a counter bored muzzle (I know it shouldn't detract), rifling is dark with some light pitting, Century import with the smaller DOT matrix mark on the side of the receiver, and the stock is a war time. I already own a nice 1933 Tula. Do you think the unusual yo marking makes it worth getting?