B for black. The rest is always guessing with Bucheimer.
The next 5 digits for the holster model number.
The last 2 digits for the handgun size.
14 and 34 are both codes for 4 inch K frames.
Dunno on the BPL.
Mike Priwer still has most of the basic Bucheimer-Clark catalog in one of his albums. Thanks Mike!!
http://smith-wessonforum.com/members...k-leather.html