quattro[Moderator]
19386
I suppose you have the modern edition, ref. 5000H, in mind.
If yes, I know of only two limited/special variants: the 36-piece steel limited Hodinkee edition and the yellow gold piece unique made for Wei Koh.
If you want to have a look at the variants of the
original ref.
6087, I listed them here:
www.watchprosite.com
Or course, there might be (there probably are) other unique pieces than Wei Koh's, but as far as I know they haven't been shown publicly.
Best, Emmanuel