My dad is getting rid of some old tools and fished this out from somewhere. There's just enough writing left that I'm pretty sure this is a #66 Fray shown here http://www.sydnassloot.com/Brace/Fray2.htm
His is in need of a cleaning/degreasing but all the moving parts work smoothly and the bits look in good shape to me (but I'm no expert). He asked me what I thought it was worth and I told him there was a human subspecies called Neanderthals that would probably pay more than he did new. Haven;t been able to find any past auctions with any prices to go by for a #66. So what's one of these worth?
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