I have a Colt-Berdan rifle in .45-70 (not the Russian .43 Berdan Cartridge). It has no marks on it, even sight range marks, except each piece including stock is stamped "M" for model. Dr Ed Ezell once told me that it was a Colt Factory Tool Room Model, the one they make by hand to make the tooling off of. I once had a Colt Berdan carbine (SN 5)in .43 Berdan and there were several small differences in the action details. The barrel is only hand tightened into the action and the mainspring is not tempered and very weak, so I know that it was never intended to be fired. Thanks,
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Tonkin Gulf Yacht Club
68-70
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Tonkin Gulf Yacht Club
68-70