authenticity of 16750

[3inst3in]

Hi guys, wanted to see if you can help in authenticating a 16750 i'm about to pick up and help confirm the things I've noticed so far below...

1.) 8.1 mil serial - 1983 watch. It matches the clasp code "H" which also means 1983. The 16750 matte dial comes with a correct 78360 bracelet and 580 end links. The clasp has the "flat 3" for the 3 in 78360.
2.) Appears that hands have been replaced since the luminova can be seen after some sunlight. The markers on the dial are not lighting one bit.
3.) Checked that between both lugs have - ORIG ROLEX DESIGN 16750 and STAINLESS STEEL with serial number.
4.) Appears to be MARK I dial - The "AHC" align and the coronet is tall and slim.
5.) Appears to be correct hand stackup for 16750. Hour - GMT - minute - second
6.)It has a white date wheel with the "round 3", and open 6 and 9's for all dates (6, 9, 16, 19, 26, 29)...the "30" looks different for some reason...the 3 in 30 seems to be more bold in font.
7.) It appears to have correct beat rate, hacking, quickset, the date changes counter clockwise/ upwards...is this right?
8.) When winding the watch, it seems really coarse..not smooth at all...is this normal? I've noticed a few other 16750 owners with the same issue...
9.) bezel appears to be authentic...not sure..

any help would be great...thanks guys.