There is also a 340b in the Morphy’s auction - estimate 2,000 to 3,000 USD! Something clearly wrong and I don’t think it’s a misplacing of the decimal point.

I do love these prewar Mauser .22’s and have several. The MM 410B, MS 350B, and MS 420B are great rifles and seem to get all the collector interest, but my personal favorite is the little MM 410 (without the B). Very hard to find these in any condition, but what a sweet little rifle.