I corresponded with Chad who said the sn in the guide is a known correct as it came from the original owner so it's not like SN 8650 is cast in stone as the last one. My impression is nobody really knows what SN is the last one. Regardless, fortuitously in yesterday's mail I got a coupon for 100 bucks off for any purchase over 500. I have a Cabela's Visa card. Needless to say, though I really didn't need it, The SBH has a new home. It looks good next to the other SBH in the mahogany box SN 299. I asked Cabela's to contact the person they got it from to see if there was any pertinent history or if they were the original owner and if the box and gun came together