Registered Key Holder Vtg Brass Chain Carborundum Centennial 1991 Niagara Falls. Excellent vintage PREOWNED condition with no visible flaws. See all photos! Ships via USPS First Class Mail. This is a vintage brass and brown leather keychain from 1991. Celebrating the Carburundum Centennial 1891-1991. Has an embossed design on the front with the Centennial information. On the back it says ?Registered Key Holder? 2750. The address is The Carburundum Company in Niagara Falls, New York. A cool collectible! The Carborundum Company, doing business as Carborundum Abrasives, North America, was founded on September 21, 1891 by Edward G. Acheson in Monongahela, Pennsylvania. Its industry is abrasives and automotive/industrial applications and its headquarters were in Monongahela, Pennsylvania (1891-1895), Niagara Falls, New York (1895-2002) and Worcester, Massachusetts (2002-present). Thank you for visiting our store and check out our other great listings! Please see all photos for Condition Ann Measurements. Please ask any questions prior to purchasing. We are happy to combine shipping in the USA.