Was getting to go shooting with my son today and we pulled out a model 57 dated to 1979-1980, a model 57 from 1965 and my 657 no dash, all with 4” barrels. My son said that the S serial 57 looked fatter than the N which got me to measure the barrels, the N serial number measured 4.25” and the 657 measured 4.25”, but the S serial number measured a whisper under 4”. All three barrels and forcing cone area look identical, roll marks are lines up in the same places in relation to the front sight, really can’t see any evidence of work done. Is this possible to come like this from the factory or has it been worked on?
Thanks
Thanks