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WICO Computer Command Trackball

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This trackball was made specifically for the CoCo's joystick port. No adapter needed.

Original Spectrum Projects price $69.95; by August 1986 only $19.95.

WICO's model number was 72-4550 [1].
WorthPoint photo from eBay. Note the "RS" sticker (for "Radio Shack"). Other platforms had similar identification stickers such as "AT" for Atari.
Another Worthpoint entry showing complete package contents.

Gameplay footage on YouTube