Mine was a damascus bbl'd side lock made by J.P Sauer.
It had a tiny JP Sauer mark (on the action face IIRC).

It certainly had nice craftsmanship, wood and metal fit and finish.
Even w/o the Sauer mark, it could clearly be seen as a quality if not utilitarian piece.
But the Manhattan Arms name gave it a Belgian Clunker status as far as the dealer selling it was concerned and I bought it for $100 at the time.
Should have kept it too!