Best post a pic. Muir is likely, I`d expect the brand moulded into the windlass drum on top, but my Muir experience is horizontal only. Can you look underneath at the motor unit for a brand? You could take a pic and send it to Muir, they are responsive and should be able to help even if it`s not theirs.
And welcome aboard!
2005 Integrity 386 "Sojourn"