I just purchased a P220 compact.When I rec. the sig I was not familiar with some of the labeling and need some help. The label reads 220 compact 45 3.9"T/T STS. It does not a decocker.
Can anyone tell me what T/T and STS means.
Thanks for any help.

Pretty sure 'T/T' = Two-Tone. I'd expect Natural Stainless Slide over Black Anodized Frame in the case of your P220 Compact.
No Decocking Lever...Any chance yours is an SAO (Single Action Only) variant?

Welcome to SIGforum...

That sounds like a homemade label. Can you show a picture of it? And the gun?

DAK is another possibility, but yes, the label should indicate DAK or SAO.

You are right on target, natural slide and black frame. Also mine is SAO. Thanks for your help a & quick reply. Have a good HOLIDAY.

I have a DAK on my 4.2" that went thru the custom shop as I was told but Sig can't tell me what all was done on it. Serial # G 377xxx. Will send pictures of label asap.

Having problem uploading picture will work on it.
sorry