It's easy to say all that, but this is less common looking. The rack is the first thing that made me think 'The Best eBike.' But this is an uncommon bike, I guess considered a failure as they didn't seem to copy it.
Identify and provide good info are two different things. With a weak id I'd say you're not in a good spot for parts, 60v is not exactly common in the generic so questions, questions. If I'm on the right track that should be a brushless hub and you could try out a leftover Yescom 1,000w controller, pushed to 72v, etc. If you're not so bold, I'm not sure about 60v 500w range brushless controllers.