Wrap-over seat stays and lug design suggest this one may be one made in the Gazelle factory in NL. If the cranks are Stronglight branded, the Bottom bracket may actually be standard BSC threading rather than Raleigh Proprietary 26 tip threading. Although you have kept the OEM equipment, you could upgrade the crankset to a cotterless alloy one and save a bit more weight in the rotating parts (where it counts).
All in all, this is one of the most iconic "Ten Speed" bicycles of the 70's. Looks to have been garage kept and minimally "beaten upon" for its age.