I purchased a Pre-Model 20 S&W Heavy Duty with a 5 inch barrel off of a Mountie, who purchased it off of another Mountie, that used to carry it in his constable duties, until issued the M10 S&W, in and around 1971'ish.
It was first imported with a batch of 100 S&W Heavy Duty 38-44 HV revolvers, in 1940 for the BCPP force. Then was "loaned" to the RCMP who took over thier duties in BC during 1950.
It's stamped BCPP next to the lanyard ring.
It's a fun revolver to shoot for sure, once one gets used to the fixed sights.
This big ole N-frame really absorbs any preceived recoil and has an awesome DA pull.