Well, it's still a good looking pistol. Especially that wonderful lock !!
Had I seen this pistol, even if I had known the correct analysis above, if the price was reasonable, I would have bought it anyway just to get the lock for my lock collection. LOL
The brass hardware I would keep for a later unforseen project. LOL
But that's just me. Again, very cool lock.
While belt hooks were used on pistols all over Europe, they did seem to be especially popular on the Peninsula, as you mention. You see them on pistols and carbine length long guns both military and civilian of all types.
Again, really nice lock on that pistol.