This genuine HP 40 51640A ink cartridge is a must-have for enthusiasts of the HP DesignJet product line. The unit quantity is one and it was manufactured in Singapore, guaranteeing its authenticity. The cartridge is ideal for large format printers with inkjet technology and outputs black & white prints. The item is sealed and expired in 2001, making it a collector's item for those who appreciate the history of HP products. It is perfect for those who want to add to their collection or for those who need a reliable cartridge for their vintage printer. Don't miss the chance to own this rare and genuine HP ink cartridge.