I have a H&R starter pistol, .22 and 9 shot, looks to be a parkerized type finish. Markings on the receiver, left side above trigger are "H&R INC GARDNER MASS. U.S.A. MArkings on the solid barrel are "STR. 0.22" , 2nd line "22 SHORT BLANK" 3rd line "MADE IN U.S.A." Seriel # on bottom of pistol grip "AY063258" Purchased in 1980 for $70, I have the owners manual and original purchase receipt. I'm looking to sell (eBay ?) and don't know a fair price. Thank you for any advice & interest.