A little hunting and we have

http://www.cornwallmodelboats.co.uk/acatalog/krick_winches.html

ready to go

Hi robtroi

I khow of a person who you might be able to talk Anchor about his name if Saintsalvio , he has an anchor winch on his tugboat!
Just send him an PM I'm sure he would help

Ed

Do you mean a system to allow you to lower and lift an anchor via radio control?

Generally this is a home build, wind the chain onto a drum and use a geared down motor you will need limit switches of some kind. You could use a drum type sail winch servo

http://www.cornwallmodelboats.co.uk/acatalog/sailwinches.html

Your anchor needs to have some heft to cut down on tangles etc.
On all the larger ships I have seen the actual mechanism is below decks so its hidden from view so your need is for function not show.