Re: how many winds for a 50's pickup
Im not sure. if you are asking about strat pickups or tele etc.
Strats went into production in 1954, thats 6 years where stats were being built in the 50s. Thats a lot of guitars too. Fender factory like most pickup manufacturers wound their pickups by hand , and the amount of turns often varied by a lot. There is no magic wind number for 1950s fender pickups. It can be anywhere from 5.5 to 6.5 k ohms.
Currently on the market for 50s style pickups there are a number of offerings from SD, as well as many other companies. These pickups all have slightly different wind values, use different wire, different magnets etc. Even fender itself offers both the CS54 pickups as well as the Fat 50s.
So what really matters is....what (50s style) sound are you after? There will be a pickup on the market that will replicate that.
Or if you really want to go deep...get some antiquities custom wound and aged for you after consulting with the SD custom shop...