The High Standard Sentinel Deluxe R-107 was made in the late 1960's to the early 1970's with a short run time. The value range currently is $25 to $200 due to various models. The 4" single action on the low side and the 6" double action with .22lr and .22Magnum interchangable cylinders on the high side. There are several sites on the web offering parts and breakdown sketches. In late 2007 at a Christy's auction house, a 6" barreled double action R-107 was auctioned off for $180.
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