I always notice different stampings and makings ( numbers and letters ) under the grips of most if not all S&W revolvers. Do they mean anything? Or just inspectors markings?
You probably had no idea what a question that was.....hope this helps:
Frame stampings - refinish/rework/other:
(Note: Almost any statements about S&W is presumed to be trends, and should not be taken as rules.)
'B' or 'N' stamp:
ahead of pre war serial # on the barrel flat (or in shroud), rear face of yoke and by itself on right side grip frame on commercial guns (only on left side grip frame post war) for an original Blue finish or for an original Nickel finish with that letter. The lack of either the 'B' or 'N' can indicate that it left the factory nickeled. Also there was a larger B behind the barrel serial # for the Bright blue optional finish in the post war era - early ‘50s when satin blue was standard.
“I've seen nickel Triple Locks with N stamps. I've seen them without it, too. Pre-war guns MAY have an N, or they may simply lack B's. The post war and the 1950s period, was one of much evolution. There was the usual transition when finish code letter stamps were dropped and frame code letter s/n prefixes began, when there were neither letter stamps on major parts (except the butt)." Lee Jarrett
Assembly (Work#s):
3 to 5 digits, are on the yoke, yoke cut in frame near the hinge and inside of the sideplate, pre war and early post war, changing to the yoke, left side of grip frame and inside sideplate after model #s were assigned. You know they are assembly #s because of those 3 locations that always match on guns that are original, and that’s the only usefulness for them after guns leave the factory.
Misc. single digit letter or number:
stamps in yoke and cylinder and/or grip frame either side are fitter stamps and inspector stamps in general. L on face of cylinder indicates left hand thread extractor rod.
Star by the serial #:
on the butt (bottom or left side of grip frame) indicating factory rework & rework dates declined by early ‘60s, eventually no marks and some say refinishing was discontinued for awhile. Currently they do refinish. The blue is blacker than previous factory finishes, some were not only unmarked on the gun but came with minimal paperwork to document the work.
Refinish/Rework Dates:
for a return to the factory are 3 or 4 digits depending on the actual date (sometimes 5 or 6) placed on left side of grip frame on the 'toe' stamped vertically or horizontally, and will not match any other stamped #s. Ex: 3.48 for March 1948, 10.2.57 for Oct 2, 1957, etc.
Sometimes letters in a rectangle or diamond, B (blue), N (nickel), or S (standard/blue) with an R (for refinish), on 'heel' of left side of grip frame.
Photo thx to Masterpiece.
An S followed by diamond was one of the ways S&W indicated a refinish in S&W blue.
Usage of the star and the rework date stamp varies depending on the time period. So as you can see, this is not an exact science.
R stamp:
"The "R" [under barrel of a trans. Kit Gun for example] indicates an “in house” rework of the revolver [on a gun that never shipped and therefore would not have a date stamp as opposed to rework on a customer gun]. The gun was reconditioned probably after World War II before the factory could sell it." Roy Jinks
Diamonds/circles:
were stamped on replaced parts or heel of grip frame on left side for refinish followed by letters, sometimes in a rectangle or diamond, B (blue), N (nickel), or S (standard/blue) with an R (for refinish), on 'heel' of left side of grip frame. A circle under the barrel indicates that the barrel was replaced.
SebagoSon’s photo
Parts modified by the factory on a new gun like a shortened barrel BEFORE originally being shipped can have a diamond stamp sometimes with an S inside indicating service dept. work, but no rework date! There might also be marks like <S> (silver), <G> (gold), or a P (plated) with a circle.
A diamond can mean:
"Parts on Hand"- i.e. replacement parts sold out the door.
A part replaced by the factory.
I believe I have seen it applied to a barrel or two shortened at the factory. I think it can mean a gun that had service work done- just like the Star was used.
Service Dept. Refinish:
An S on the grip frame usually means 'Service Dept.' and was added when they fixed cosmetic or mechanical problems found on completed guns. S let the bluing dept. know that it needed to be returned to Service instead of the Fitters like the other ~200 barrels that they blued with it. Parts were blued in large batches.
Caliber code single digit number stamped on grip frame:
The normal side for the cal. code # is the left side. N frames.
357 Mag doesn't have a number code in my observation
38 special will have an 8
44 special has a 4
44 Mag has a 0
45 ACP has a 5
45 colt should have a number 7 on either side of the grip frame.
NOTE: This information is just rules of thumb and not at all meant to be an all inclusive list and often lack consistency (especially size of digits) like anything from S&W.