.22LR my grandpa brought back from WW2 Europe

[vintage hunter]

I haven't done a whole lot of research on the ES350B other than to correctly ID the OP's so I can't comment on how rare or scarce it is. There's also an MS350B. MS=repeater. A buddy has one and according to some research I did for him a couple years ago they are considered to be very rare and worth a good bit more than the ES single shots.
I've had the opportunity to shoot my buddy's MS on several occasions and found it to be exceptionally accurate, even with cheap Wally World ammo. He made the deal of the century on it, got it for $100 at a yard sale.