I have a 1 B&L that was assembled weird, the pan and dog are on the left if the spring is toward you. I've never seen that before but I don't use alot of long springs.

Possibly a disassembled #11 trap that someone played with?

No don't think so, mirror image of a regular one. Guy putting them together was hungover.lol

I think most of the traps we come across like that have been re-assembled by left hand trappers.

But I bought a dozen Duke stoploss that were like that right out of the box (Factory defective). What a pain for a right hander. Try setting that Blake and you will see what I mean.