Neil,
As Doug said, eBay is by far the best way to go to get the most exposure and the best price. Personally, I wouldn't entertain any offers until we look at it. Here on the RKS forum, we are fortunate to have the contributions of a veritable who's-who in Randall Knives including the Randall shop foreman, the president of the Randall Knife Society, a couple of authorized Randall dealers, several of the most well respected knife purveyors on the planet and many notable collectors. We even have the author of an upcoming book on Randall knives who should certainly know an approximate market value for your knife. So let's see some pics!
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Rick Bowles RKS #012
www.RBscrim.comN.K.C.A.
NRA Endowment