Grouse Man - I have completely dismantled this shotgun and there are no marks, proofs, gauge marks anywhere. None on the action, locks, barrel etc. etc., I suspect it is American simply due to the lack of marks. I am fairly familiar with proof marks etc but one can't decipher whats not there. I was hoping someone might have a similiar gun, it is rather well made (polished) smooth) inside and out. Sorry no pics at present. --- John303.