Don't be too quick to just replace it. Have you approached a starter/alternator rebuilding shop?
A lot of them should be able to rebuild the motor. If the motor is truly fried then they may be able to replace the motor with a good replacement since if memory serves they were a car starter motor and although old should be replaceable.
If yours is up only then ask the shop if they can wire the leads for reversing.
I saw on the sheets provided that the unit was reversible but maybe as an option. ASK. The original owner may have simple ignored it.
The rest of the windlass may just need some real cleanup , real servicing such as oil re/re, grease, new seals and bushings.
I knew one woman who loved that windlass, stripped it of paint and polished the bronze case to a high polish and kept it that way. I'm not suggesting you do that but they were/are solid pieces of equipment.
What is wrong with yours? What have you done so far?
As far as replacements go: Lofrans, Muir, Maxwell, Lewmar.
But they will cost you likely $2500-$3000 ++ for the windlass alone plus all the wiring and controls, and the changes/ deck repairs needed for a new windlass.
I did mine about 5 yrs ago and I figure I spent about 40 hours [ I did not really track it], and about $5,000 all told. THat was my own labour.
Before jumping ask those shops and ask around your marina as many people will likely have shop recommendations, even some independents who after retirements still do some on the side work.