The Allen R C SP 3000 is an adding machine / cash register system designed to help accelerate business' financial transactions in the 30s, 40s, and 50s. Combining your RC Allen SP-3000 Adding Machine with our Compatible Epson ribbon cartridges will bring your device back to life providing smooth and bold text on printouts and receipts. We carry the Compatible Epson ERC-03B Black Cash Register Ribbon cartridges which have been designed to easily fit into your Allen RC SP3000 printer / calculating machine. We guarantee excellent print quality with our Compatible Epson Ribbon Cartridges or we will refund your money within 90 days of purchase. And all of our Epson Ribbons for your Allen RC cash register have up to a 2 year shelf-life for definitive performance and convenience.