Vintage Service Advice needed from Sub aficionados

[007Sub]

Hello all,

So its time to get my vintage sub serviced. I've decided to go to RSC-NYC. I know that the movement will need a full service but with regard to the cosmetics... the watch is in good condition but could use a little re-brushing. I would never change any of the aesthetic original parts (aside from perhaps the crystal which has a few small chips and the case back which has remnants of an engraving from the previous owner).

My question is this... in terms of value retention... should I avoid having ANY cosmetic re-brushing done? Will i loose lug thickness from case re-brushing? Should I avoid even a crystal and case-back replacements?

Your thoughts and counsel are appreciated.

Thanks!
G