The Olivetti Mercator 50 is a check encoding, cash register system designed to help accelerate your business' financial transactions. Combining your Olivetti Mercator50 Electronic Cash Register with our Compatible Epson ribbon cartridges will create bold and smooth 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 Olivetti Mercator-50 printer / cash register. 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 Olivetti cash register have up to a 2 year shelf-life for definitive performance and convenience.