Just got this from a GB auction. Very nice 66-1 4 inch, with box papers and cleaning kit. Ser. # 39K3742, placing it '78 or '79 I believe. I have been looking for a nice one for a while to go with my 66-1 snubby. Now have both 2 inch and 4 inch in the 66 and 19 models. Quest is complete, maybe!: