For sale is an exceptionally rare and historically significant Casio TM-100 wristwatch, originally released in 1987 as part of Casio’s groundbreaking innovation wave during the golden age of tech-forward digital watches. This iconic model features a built-in FM voice transmitter and telescopic antenna—designed to broadcast voice signals over short distances to FM radios tuned to the appropriate frequency.

This Japan Domestic Market (JDM) timepiece is one of the rarest Casio models ever produced and is highly sought-after by collectors of vintage digital and novelty watches.

Functionality & Condition:

• The watch is fully functional in standard operations, including timekeeping, alarm, chronograph, and calendar/date functions.

• The transmitter function has not been tested, as I am unsure how to properly operate or verify it. However, the radio module appears clear and free of any corrosion, so I would assume it is likely fully functional, though untested.

• The red “Push-To-Talk” button, power selector switch, and tuning lever are all present and responsive.

• The antenna fully extends and retracts smoothly.

• Strap: The watch is mounted on a genuine aftermarket Casio strap, comfortable and period-correct in appearance.

• Condition: The watch is in great physical condition for its age with signs of use such as light surface wear. The photos best describe its physical condition.

Key Features:

• Model: Casio TM-100

• Module: 661

• Year: 1987

• Origin: Japan

• Functions: Digital time display, chronograph (stopwatch), daily alarm, date and day display, built-in FM voice transmitter, tuning wheel and microphone, extendable metal antenna

• Power: Requires two batteries (one for transmitter, one for timekeeping)

Collector’s Note:

The TM-100 is regarded as one of the most collectible digital watches ever made by Casio—beloved for its novelty and rarity. It rarely appears in working condition, and when it does, it commands significant attention from collectors of vintage tech and wearable gadgets.

Ships carefully. Feel free to message me with any questions.