I'm definitely no expert and haven't looked at Hammer guns. A few things to question:

1) hinge pin does not fit correctly. The slot seems a buggered.
2) the trigger plate does not fit into the bottom of the action correctly. Maybe this is a result of the rehardening. However, I would think an H&H restoration would be better.
3) the barrels show a LP with a 7. The rest of the date is not legible. Not sure why the barrel proofs would be barely visible. If H&H redid the gun in 1992, then the barrels were done earlier.
4) if this is an H&H refurbish, where is the documentation.

What else did I miss?

Ken