Re: Can anyone identify this device on this flintlock pistol???
First, that mark means nothing to me; let's see what others might have on it.
As for the origin, could be Austrian. Without clear markings on the lockplate or barrel, it is often very hard to tell the origin of a gun of that era. That butt style is often considered French, but it was certainly used elsewhere.
As to a gun "cobbled together", it doesn't look that way, but better pictures will be needed to be sure. A key is whether the lockplate and barrel fit the stock and are fitted to each other, also whether the other parts fit correctly. The earlier pictures concentrated on the frizzed and pan, natural since that was what you were seeking information on, but closeups of the lockplate and the muzzle on both sides should either prove or disprove whether it is a parts gun.