I bought this yesterday in a flea market for five dollars. Never knew Snap-on made knives. Looking on the Net, appears current Snap-on knives are made in China. This one is stamped on the ricasso "Sheffield England Stainless." On the scale where the bolster would be is stamped "K-AP-I", whatever that means. Overall length about three and a half inches and blade about three inches. Can you tell me about when this was made and value, if any?