Thanks for the information. I doubt seriously if I'll ever find out for sure, yet it's fun snoopin' 'round...

Redstone Arsenal, AL
Ramstein Air Base, Germany
Federal Reserve
Fort Richardson
Walter Reed Army Medical Center
Red River Army Depot
Rock Island Arsenal
Fort Riley
US Army Recruiting Command
Fort Ritchie

I'm kind of leaning(guessing) towards a government agency that was stamping the pistol to distinguish it(For what ever reason.) from military service. Could've been for nothing more than inventory. Somewhere though the clue, besides a capital R stamp, I feel is the three separate stamps marking the frame, cylinder & barrel. What, if anything, could make the separate parts important enough for all of them to receive their own stamp? They were already marked w/s/n though the tiny numbers are hard to eyeball while the R jumps right out at you...

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Caveat venditor.