I'd read somewhere, that one (1) signed longrifle, by J. Keller, was in existence. Would this be that piece? Fortunately, it's been given far better care than the pistol. My speculation about the pistol being a apprentices piece lies in it's rather 'plain-ish' features and it's small bore size (.30 - .31/ with corrosion mikes to ~.295). Perhaps I'm in error.
In all other respects, it was fit and finished fairly well; a walnut full stock stock having a 6-5/8" barrel tapering from .990 at the breech to .961 at the muzzle, a concentric ring engraved around the bore at the muzzle, a nose cap (missing) and inletted brass butt cap. The triggerguard (missing) had inletted ends, but was either nailed/ or tacked directly to the stock. The converted flintlock plate, I believe, has always been in percussion service. The lock internals are in perfect working order and the trigger is crisp. The current hammer appears to come from a back-action shotgun lock and was suitable enough to keep it in service until both the hammer cup and the nipple corroded, weakened and failed.
Is this pistol worthy of a restoration project? Had I not picked this up, I don't think it would have survived intact for much longer. Every time I look at it, it brings back fond memories of being 'detained' in LaGuardia Airport, NYC for having a 'gun' in my briefcase.