Try gun shops, gun shows, internet, want ads.
Made in 1968.
The model # 107 Series lifespan was from late 68 to late 72 Serial # Range 2,030,000 - 2,330,000
Any of the Military grip models will take a magazine with a longer floor plate. For example: http://www.ammoclip.com/H/high_stand_military_grips.htm
42 years old.
The value of a High Standard Sentinel Deluxe Model R-107 nickel-plated revolver can vary depending on its condition, rarity, and current market demand. Generally, they can range from $300 to $600 in good condition.
42 years
42 years
100-1000
50-200
the R-107 was made for .22 LR only I believe. the R-106 had dual cylinders for it. I would contact High Standard and find out. But from what I know, High Standard R-107 didn't come with a Magnum Cylinder.
It was made between 1935 - 38 see the link below for the owners manual. it's a model 107 or model 177