The MPP that Parks used as reference for his replica had a distinct feature that is a bit rarer than most other MPPs.
The black encap plug on the MPP that he used for reference didnt have the 3 rings commonly found on MPPs.....And it seems that your MPP is missing the 3 rings as well.
Parks saber also had the less common large B porthole....Which yours has .
And Parks also hasthe sloped silver sidebars , which yours also has.
This doesnt mean that yours is a Parks, it could be that you aquired one of the other variants. But then again you have to ask yourself what are the odds of getting an MPP with all the exact viariant parts as a Parks.
The best way to check if it's real -
Is take a Q-tip and stick it into the plug holes and see if any dust or grime is found in there. (Dirt and grime look very different than just spray paint) Check the tiniest of cravaces.
Smell the battery casing of the MPP, it should smell old (not like chemicals or spray paint)
Take the guts out and anscrew the guts themselves and see if theres dust and grime in there.
Take the clamp off and remove the inner sleeve (as someone mentioned earlier) and check to see if there's dried glue or dust in there.
I also noticed, in one of the pics of your lever, there is a circular stamp mark visible on the inside.....An MPP should not have this mark.
Theres also another thing, Im not sure if Parks shrouds have this features or not but, original MPPs had a thick tip on their shroud thumbscrews making impossible to unscrew completely from the shroud (I guess this was down to prevent the thumbscrews from falling off or getting lost)
I also find it very hard to believe that a 40+ year old MPP got enough wear to strip the paint off of the threading on the endcap plug but yet doesnt have the common arched swing scratch from the lever found on clamp.
I dont own a Parks MPP myself (which makes the comparison harder) but from looking at the pics you posted it seems that you MPP is actually a Parks replica with a superficial weathering job.
It seems the areas which are weathered on your saber just happen to be the areas where someone would most likely look. Real weathering gets into all cracks and and cravaces, not just in areas where one will most likely look.
DS