Hulman & Co. Clabber Girl Baking Powder Printing Plate. This came from the Hulman Co. estate in Terre Haute Indiana, where it had been in the warehouse for years. This printing plate measures approximately 2 3/4 by 4 3/4 inches. I believe it to be copper coated zinc. It is very heavy for its size, it weighs over 11 ounces. Has a few scratches but overall it’s in very good condition. Last photo taken in a mirror so you can read it easier. I’m guessing you could print with this if you have know how. See photos for details. Ships USPS small box flat rate.