On of several 2018 CoCoFEST! T-shirt styles.
This, and more styles, available here:
https://www.teepublic.com/t-shirt/2489009-cocofest-2018-2?store_id=131646
CoCoFEST! 2018 T-shirt.
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Sub-Etha Software
"In Support of the CoCo and OS-9 since 1990!" … plus Arduino stuff.