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Rare Vintage Casio GAME-20 GM-20 Men’s Digital Game Watch JDM 1980s Module 165
■ ONE OF A KIND — THIS IS THE ONLY ONE. ONCE IT SELLS, THIS PAGE BECOMES AN ARCHIVE.
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► SELLER'S DESCRIPTION
Up for sale is an extremely rare vintage Casio GAME-20 GM-20 men’s digital game watch, powered by Module 165 and produced for the Japan Domestic Market (JDM) in the 1980s. Casio game watches from this era represent some of the brand’s most creative and desirable digital designs, combining classic timekeeping with built-in interactive gameplay that has made these models highly sought after by collectors worldwide.
One of the side pusher tabs on the module has broken off. The tab is able to be positioned on the module and inserted into the case so that the watch still functions. It is believed that the piece could potentially be soldered or glued back into place. The watch is currently fully functional with this issue however it will likely not be reliable long-term, and with repeated button presses the tab may need to be readjusted until a permanent repair is made. The last photo in the listing shows the broken tab.
The watch is in full working condition, and all confirmed features and functions operate properly, including gameplay. The module is completely screen-bleed free, which is exceptionally rare to find on vintage Casio game watches.
All parts of the watch are original.
The watch shows signs of a heavily worn and aged item. The photos best describe its physical condition and should be reviewed carefully.
Key Details:
• Brand: Casio
• Model: GAME-20 GM-20
• Module: 165
• Era: 1980s
• Market: Japan Domestic Market (JDM)
• Display: Digital LCD with built-in game
• Condition: Full working order; all functions and gameplay tested
• Bracelet: Original Casio stainless steel bracelet
• Physical Condition: Heavily worn with signs of age
Casio game watches are among the most desirable and collectible vintage digital watches ever produced, and the GM-20 stands as one of the standout examples from this iconic category.
Ships carefully.
Feel free to message me with any questions.
► ARCHIVE FILE: CASIO — BRAND HISTORY
Casio began not with watches but with calculation. Tadao Kashio founded Kashio Seisakujo in Tokyo in 1946, and with his three brothers developed the 14-A in 1957, the world's first compact all-electric relay calculator, incorporating the business as Casio Computer Co. that same year. The move into watchmaking came in November 1974 with the Casiotron, a digital watch whose claim to fame was an automatic calendar that knew how many days each month had, a small feat of logic that announced how an electronics firm would approach timekeeping.
Read the full Casio story — and shop all Casio watches ►► RELATED TIMEPIECES DETECTED (4)
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