Need help identifying SIG 229 magazine

[nin7474]

Is this a P229 .40 or 9mm magazine?
I found this in my box of magazines and can't remember when I got this.
I searched online and saw that pre-ban P229 .40 magazines held 12 and 9mm held 13?
I can't imagine this being a 9mm since my P229 is a .40.

The USPS does NOT receive any tax dollars!

 

[WhiteTiger]

The 13 round is a 9mm and 12 is 40 S&W. So yours is one of the 9mm's.

 

[nin7474]

The 13 round is a 9mm and 12 is 40 S&W. So yours is one of the 9mm's.

Thanks. Guess i should sell it.

 

[shanef]

9mm - yes

 

[nin7474]

Thanks everyone. Any idea how much i should sell it for? PM me if needed

 

[DISTINGUISHED PISTOL SHOT]

Looks like an early Sig 228 , 13 rd , 9mm mag. to Me