For sale is a rare and collectible Seiko C153-5011 watch, one of the first Seiko digital watches with a built-in calculator function. Made in the late 1970s, this model represents a unique fusion of horology and early digital technology. Features LCD quartz movement - reliable and innovative for its time. Built-in calculator function - operated with small push buttons. Stainless steel case - durable and elegant Vintage digital design - iconic Seiko aesthetic from the late 70s. Landmarks Early Seiko digital collectible model Rare calculator watch a piece of technology history. Perfect for vintage watch enthusiasts and Seiko collectors. The watch comes with the box pictured