Just wondering what it cost to have a gun lettered is? As I just purchased a Lend lease pre model 11 or at least I think it is, It has the Australian and British import stamps and a no prefix 999XXX serial number, My guess is manufactured frame just before plant closing in 1947 but with pre war stamped single line address, is referenced in 4th edition, made in USA on right frame, parkerized with lanyard half moon front sight, walnut grips, seem like some conflicting info as to what constitutes a model 10 and model 11? I may just be confused. thanks for any help in understanding. Craig