1973 750 commando roadster Combat Engine parts?

I am restoring a 1973 750 Commando Roadster The camshaft has one lobe badly worn . I was told that the camshaft may be a Combat camshaft and that in that year they intermixed a lot of the engine parts. The breather on this motor is on the back. Does anyone have any info on this and how would I determine what camshaft I have? And did they in fact use the same parts in both the combat and standard motor.
Thx
Drummer99

Are there any markings or numbers on the cam.

Combats were only made in 1972, so if you have a red plate stamped with a build date of 1973, it won't have been built as a Combat.
The cam, carbs and compression (heads) were different for Combats, and all the rest was common parts.
The higher compression head was shaved 0.040", and stamped with a C on top.
The Combat got a disk brake as standard.

A worn cam lobe seems to happen on some Commandos, although Combats were not particularly known for this (?).

Could the motor have been rebuilt at some later stage, possibly using combat parts ?

If it is a true 1973 750 (Mk V), the cylinder head should be stamped RH6 (9.3:1) or RH5 (8.9:1), not "C" which is a 10:1 head. The serial number should also begin with 22XXXX (possibly 23XXXX). These were built from about October 1972 to about mid-1973 after which only 850's were built.
A Mk V 750 should have black clock holders and the large taillight as the later 850 models. 1972 Combat models had polished (short) clock holders and the smaller taillight. Mk V 750 had the standard camshaft (not the Combat grind).

Both Combat and MkV have the breather from the rear of the crankcase, 32 mm Amal carbs, front disc brake, and long blade Lucas handlebar switches.

Combat barrels were painted black from the factory, while Mk V were silver. Of course, many were repainted over the years.