is to made the lugs 20mm and NOT 19mm. 19mm straps are hard to find. 20mm straps are plentiful. Plus, it needs to have a screw-on case back....and a screw-in crown! Other than those changes, I agree totally. A purely "tool" diver!
BTW, I have one of the 1966 TIMEX 600ft Divers and LOVE IT!