I have two Henry doubles. The first I'll mention is a .450BPE serial# 3143 and all the attendant information listed in the Donald Dallas book which has become THE Alexander Henry reference is perfect straight across the boards. However my other Henry double seems to present a problem, at least to my interpretation. It is a double muzzleloader, serial# 661. Now if you reference the Dallas book the breakdown info you find is B/S/B/L/R. Try as I might, the only interpretation I get from that is that it is a Best gun, one which is a Single Breech Loading Rifle, which it most obviously is not. So is the goof on my reading of the code or in the printing of the list in Mr Dallas' book? I am very curious as to what exactly the answer to this is.