Left knife, post 1994 Model #15 CDT (Cut-Down Tang) knife with options; Center knife, '87 thru '94 production Model #14 'Attack' knife with Model #1 style hilt (guard) and Border Patrol handle shape; Right knife, post 1994 standard Model #15 'Airman' knife. If the blades are stamped with an S to the right side of the RMK logo, the blades are stainless steel. Price is between buyer and seller; do your homework. eBay completed (and sold) auctions will give you a current market value on similar knives. Hope that helps...