This is a 2 part epoxy primer from Southern Polyurethanes without any top coat. The owner of the company found out people were using it as a topcoat so he added UV protection to the formula. Went on well, filled well and has the perfect gloss. Front axle was assembled and painted as a unit so entirely black with no exposed cad plated bolts except The sway bar/front axle mounts, lower shock mounts etc. Go here:
http://historic.motoringinvestments.com/ and enter the old site. Under Mercedes you will find several original cars with underside shots. Of particular interest would be the white 280 listed as the "Holy Grail" since this is in your age range.
Look for traces of the assembly line paint markings (Dotology) as you take it apart. Front is fuzzy but mostly steering links etc. The springs will have certain marks for differing spring rates.
The aluminum castings on the engine are raw aluminum. No paint and no clear etc.