18K Gold plated is the one they used in the WOW, I have made a quick collage-photo last year from the original movie-picture, a zoomed-in part on the watch and my 1000, which is in the left box.
I made it right after I spotted he was wearing that 1000-model.
See here:
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There has been a real gold, non-plated 1000 though, but it is different in design than the one Leonardo DiCaprio is wearing (Bezel, dial, bracelet):
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Noticed something else on the Wow movie watch?
Click to expand...