This is a vintage Citizen pocket-size calculator in true credit card format, preserved new in its original box. Designed during the late 1990s to early 2000s, it represents the peak of Japanese miniaturization in personal electronics, combining extreme portability with dual power technology. Produced by Citizen, a globally respected Japanese manufacturer, this ultra-slim calculator was engineered to be carried permanently in a wallet, exactly like a bank card. Its dual power system (solar and battery) ensures reliability in everyday use, while the minimalist layout reflects the functional design language of late-20th-century consumer electronics. Beyond basic calculations, this model was conceived as a practical personal tool for daily life: a discreet calculator always at hand, suitable for quick computations, reference notes, or secure personal codes, long before smartphones replaced such dedicated devices. The unused condition, complete packaging, and preserved flat profile make this example particularly attractive for collectors of vintage electronics and design objects. CONDITION REPORT • New old stock, unused • Original box included • Device fully functional • Solar and battery power operational • Flat, undeformed body • Keypad and display intact • Minor storage marks possible on outer packaging only COLLECTOR APPEAL Credit card calculators represent a short-lived but iconic moment in technological history, when manufacturers competed to reduce electronics to wallet size. Citizen examples are especially sought after for their build quality, reliability, and Japanese engineering. New-in-box specimens are increasingly rare and highly collectible within the fields of vintage electronics, industrial design, and everyday tech ephemera. Worldwide shipping. Shipping fee includes professional carefully packaging to ensure safe and secure delivery.