Vintage XX Case 12" Knife Made In Bradford Pa.USA Professional Butchers With Vanadium Steel, Just Like it Says on the Blade & it has Turned a Bluish Color , We Figure it to be Mid-Century at a Concervitive Estimate Best,Also has the Original Cardboard Holder .However We Searched the Internet & Couldn't Find One Exactly Like it. If Anybody Knows Anything About it Please let Us Know. It Appears to Never have been used & been kept in someone's attic or closet all this time. As Always Thanks for Supporting our Charity!!!