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John, this looks to be unique to Buds and s few vendors. It does not show this on the Sig website. Cheers and stay safe!

Its a SIG or a manufactures model code. Every Sig and or firearm has a unique model code. For example a Sig 320 compact (320C9BSSMSMA). You need it for warranty or service work etc.Only the manufacture knows what these letters or numbers mean.