Jim,
Your Parker is a nice transition gun from the lifters to the top levers. If you look close at Marks gun there is no dolls head extension going into the top of the action, like the lifters. Marks gun also has no rib matting (squiggles on the top of the rib). There were only about 1200 top levers made with no dolls head extension, as apposed to 35,200 with the dolls head extension. Yours has the dolls head extension but still no matting on the top rib. In about 1886 all of the the Parkers built had the matting on the top rib. The ribs were matted so that there was a non glare surface along the sighting plane.
You have a nice piece of family history. A nice display case is in order.
Kurt
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