I ran across a Gunbroker auction for a P220 and it had a serial number I didn't recognize it's sequence. Usually, they run in the G xxx xxx sequence. This one runs like 37A00xxxx.

Can someone tell me when this was made and if it is special in any way, like was it a LEO gun or a special run. Or, where I can find out, please. Thanks.

SIG Sauer changed its serial number scheme just a few years ago when they started producing the frames here. The one you reference is a very recent gun, likely nothing special but we can't tell without details. Following is a list that I composed, however, it may not be complete.

Welcome to SIGforum.


SIG Serial Number Prefixes

A P49 military version of P210
A(X) P229 (X) can be A through M
B P228
C P245
EAU P250
G P220
M P225/P6
P P210 civilian versions
S P230/232
SA P239 (SA4 is often 357/40 cal)
SBU P239 with US made frame
SP SIGPro
U P226, also UU for US made frame
24B SP2022 with M1913 flat profile frame rail
26C P290RS
27A P238, (27B post recall)
33A SP2022 with rounded profile frame rail
37A P220 with US made frame
45A P229
47A P226 Mk-25 with US made frame
50A P224 (40), 50E (9mm)
51B P227
52A P938 (9mm), 52B (22LR)
54B 1911
55B P229 SS Elite
58B P320

Welcome to the forum.

Gary, if you are updating your prefix list (?), here are two more:

54A - Sig 1911 (Nightmare carry) .45acp

GS57 - Sig 1911 (Ultra Carry Two Tone) .45acp

Gary, you can add this to your list, too.
46A = P225-A1

Also, for the P228, AHU, AJU, and AKU in 2012 - 2013, for the US made frame.

My P220SAO purchased early 2016 starts out 37B0

quote:

Originally posted by JPD217:
My P220SAO purchased early 2016 starts out 37B0

The P220's prefix should be "37B". I think Gary's list contains the error of "37A" for the P220's US frame.

quote:

Originally posted by 12131:
The P220's prefix should be "37B". I think Gary's list contains the error of "37A" for the P220's US frame.

I believe it is both.

quote:

I believe it is both.

Yes, I compiled the list from actual photos. These new serial number prefixes need to be in the Serial Number sticky.

quote:

Originally posted by airbubba:
Welcome to the forum.

Thanks folks, that is just what
i was needing.

I have a US made P220CO SAS 2B with a 37A prefix and a P226R MK-25 with a 47C prefix.

That reminds me... I need to look at that MK-25 to see if it has that new MIM trigger and MIM trigger bar.