Help with Submariner 16803 authentication

[rolex123*]

I have a 16803, 1986/7 Submariner with a probable aftermarket or converted dial and a questionable case. All cases from this time frame have non exacting set of numbers and letters in the fonts for sr.# and md.#'s...however this on has real errors i believe.

Inside this case is a correct 3035 mvmt and has correct weight 48.3 dwt. 47.5 is what several other 16803 case+3035 weights only, with non stone, blue and black dials, i believe the 0.7 dwt can be attributed to the aftermarket stones and gold bezels. I was wondering if anyone could help me in authenticating the case or any part of this watch. Pics attached in zip.

Thank you,
Jack in Florida