For what its worth ,here is my two cents worth ,as it has been pointed out on this forum many times ,make sure what you have , by a competent gun smith familiar with Parker shotguns ,list it on Gun Broker ,start at $0.01 and the market will let you know the value very quickly !You can put a reserve and if you get the price that pleases you ,then you sell, if not ,the buyers of such guns will bid to what some one is willing to pay for the gun , I recently sold a nice " used " condition GH grade 12 Ga. with a little bit nicer condition than yours but in 12 Ga. not 10 ,the guys bid it up to around $650.00 and she was gone ,the gentleman that bought the gun e mails me occasionally and is very pleased with the gun and enjoys using it ,and it brought fair market value ! Just , " For What Its Worth "