Hello SAA Collectors, Colt's had the finer thread pitch of 24 threads/inch on 1st Gen SAA's and on some or all 2nd Gen SAA's, but does anyone know when Colt's changed to the courser thread pitch of 20 threads/inch? Was it at start of 3rd Gen production (i.e. S/N 82000SA)< or was it earlier in...

Hi everyone i have just acquired four SAA 1st Generations with the earliest being the first or second year of production and the latest being 1905. The oldest one is not in functioning form hammer and trigger work but the cylinder will not advance. The other 3 are full functioning,two blued and...