I imagine that if you were alive at the time, the extra cost of the RM gave you the option to specify a variety of custom options such as barrel length, sight choices, hammer type, and set-up specifications.
Today, those variations have created an appealing field for the advanced collector. (I doubt that was the original intent, though!)
But, the fundamental aspects of quality workmanship and high order shoot-ability leaves little to quibble about amongst the entire field of pre-war target N-frames.
