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Sorry to hear of your loss, Derek.
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Let me get my references out - back shortly.
I've been researching it. That was a Sig P220 Compact with a special configuration. You said it was two-tone and made in 2012. The two-tone feature was dropped from the P220 line in 2010. I would say, based on that, part of the special configuration was providing the two-tone finish in 2012. Unfortunately Sig Sauer does not publish their Special Configuration codes. I can call on Monday to see if they can provide the configuration details.