TW I would say yours is like a 06-1084 from an 73-74 850 if it has a 1S grind. Definitely not MKIII because the DS scrolling does not break out beyond the bush. The fully machined shaft is a modification as production cams were not like that. Also the intake and exhaust lobes have the same width makes it early. It may not be stock or old.
If you look at my pix anyone can see the wear from the split MKIII TS bushes on the bottom five 06-2808. Next those 06-2608 all have wider intake lobes. no sling ring or any prep for cam end breather.
Note the 6th up cam has no evidence of MKIII type cam bush wear, has the narrower intake lobes like early cams. no sling ring or any prep for cam end breather. NO DS break out oil groove typical of all pre MKIII.
Top cam is earliest in this pix, is a later 200000 cam, 1S grind, typical residual sling ring, early narrow intake lobes, but no further timing breather preparation i.e. disc drive notches or gun drilling/cross drilling in sling ring .
I think intelligent people should see the foolishness of call the 200000 series a "combat" without adding "tune" or "breather" (or both).
Sorry that I don't have a pile of papers/drawings but the actual hardware I pulled out of the over 35 engines starting in 1988 tells volumes...I have this habit that eventually the parts get examined. It was part of both my professional career and hobby.