Mike,
actually it is yellow gold, but tarnished even the case - hence the impression of rose gold (maybe also the lighting...) - it is a NOS example including the whole set: strap, buckle, hang tag, original box, but sadly no chronometer rating paper.
I have been lucky to buy 2 NOS examples out of that "time capsule" some years ago, a 2364 and a 2366 (which is my avatar picture) both 18K yellow gold - untouched so far, had a cleaning only as the oil had totally gummed up.
These are finds one in a lifetime I guess...
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