A vintage commercial letterpress printing block featuring a metal printing plate mounted on a thick, solid wooden base. The plate, likely a stereotype or electrotype, contains raised and mirrored characters arranged in two vertical columns. The content consists of complex data tables including multiple rows of six-digit integers and various fractions, such as 1/4, 1/2, and 3/4, set in a classic serif typeface. Mirrored headers for 200 and 1,000 are positioned at the top of the columns. The wooden base is characterized by a tongue-and-groove or finger-jointed construction visible on the side profile. No maker's marks, foundry stamps, or dates are visible on the metal surface or the wood block.