i was at goodwill the other day and saw one of these puppies sitting on the side plugged in. it had black vinyl casing--not the natural wood. i went to test it out and the light was flickering on and off. never used one before so i didn't know if it had an internal speaker or not. pushing buttons but no sound so 'lemme run to my car real quick and grab my earbuds'. as soon as i walk away another guy comes up, tests it out for 10 seconds, and cops it. did i fuck up or what?? oh it was $30 too...

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apparently first roland product ever produced, 1972

Sounds like you just got a steal.