A brief synopsis on vintage Daytonas...
Paul's manual wind vintage Daytonas (6263, 6265, etc) are usually of the Venus bi-compax variety. Most other variations offer this movement as well (or Asian 7750).
DW's manual wind vintage 6263/5's are the "Valjoux 23 copies" (not very reliable, and bi-compax. In truth these movements are unknown, and a complete mystery). To upgrade these movements, one could install a Swiss Valjoux 23; also a bi-compax, but very robust and reliable. A bit on the pricey side too.
In addition, DW's can come equipped with the Venus, or an Asian 7750 with or without the winding rotor.
Or... You could get a DW case kit for Valjoux 72. This is the most expensive route to take, but provides the ultimate in vintage Daytonas (genuine 6263's 6265's have Valjoux 72's reworked to Rolex spec caliber 727).
Sorry for the brief write up; if I had more time, I could elaborate more. Hope this helps...