Good morning all, I have received the watch. What a marvel! The dimension is somehow small for my (also small) wrist. I've changed the strap, using the one the seller included in the package. I've stored the original Omega one, I'll decide and see later what to do with that.
I expected the classic pin but what I got is these three pieces in the following photo. Basically are two cylinders with pins inside and a spring in between. The two cylinders are covered with some green dirt material that I don't know.
Sorry for the bad picture:
And finally here it is on my wrist: