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I picked up this PAL RH50 knife at at an estate sale and tried to research it on Google and could find nothing resembling it, at least with this handle. I did find a Remington example with a similar handle with a Remington UMC logo inside the circle. Mine did not have the logo and on close examination I realized it had been buffed off with only the designation Trade Mark at the bottom of the circle. I am guessing that PAL was using left over parts from Remington and this knife would have been part of their early production. The sheath has the Boy Scout mark but there is no evidence of one on the blade.
The book "New England Cutlery" by Phillip R. Pankiewicz has an interesting short history of PAL. It has line drawings of an RH 34 with a similar shape but a stacked leather handle rather than what is shown. It may have been made in Holyoke, Ma or Bridgeport, Ct. The company seemed to manufacture from 1939 to the early 1950s when the factory closed because machinery wore out. PAL started out in Plattsgurgh, NY.
I gave up looking for a PAL RH50 with the UMC handle and instead explored Remington UMC knives looking for examples with the hard rubber UMC handle. I found several, most of which were RH28's that had that handle and one exammple of a RH29. The most significant difference between the PALs and the Remingtons was the ponnel attachment. The dRemingtons' tangs went through the pommel and were attached with a split nut which could be tightened. My PAL and others are attached with a brass pin going through the pommel into the tang which does not protrude through the pommel. Some PALs may use the Remington technique with the split nut. One drawback with the pin attachment is lack of adjustment without dismantling the handle. My knifehas a loose handle and pommel. I don't intend to tighten it. A Remington RH29 example is attached.