If the hand-winding feels rough that's likely to be the reverser that's faulty and in need of replacement.
If you buy a watch of this age second you should always budget to have it properly serviced, most watches being sold haven`t been serviced properly for years.
I`m not volunteering on this one, I`m spending the next few months working on my own watches plus a few jobs from folks who I`ve helped in the past.