This is newly manufactured ribbon for various dot matrix printers from the 80's. The machines are based on the Seikosha GP 500 series which include. These come in a sealed bag and white box. They have a shelf life of 2 years.
Commodore MPS 801 Amstrad 8259, DMP1, PR10 Atari 1000 series Brother M1029 Comrex CR 220 series Epson CR220 Philips P2020, PW20, video writer 20/28 Radio Shack DMP110 Seikosha GP500 series