Originally Posted by Kernel Crittenden

S&W made a slew of interesting guns in this time frame, June of 2006 to about January of 2007. There were nickel and pinto M36-10's with CLB prefixes, M25-15's like your's (CLF & CLH), M24-6's (CLD & CLE). Others, no doubt, that I've never seen.

They were all made in small numbers and had Product Codes that began with an atypical "15", a red flag of something special. I suppose they were all made for Lew Horton distributing. They probably requested the s/n's be reserved for their use, though the prefixes were typical of the s/n's that were being issued at that time on the standard production line.