This is the first Omega speedmaster Professional Moonwatch Moonphase 1985 made in limited numbers 1300 in total so makes these model very hard to find and very special these days. The Moonphase reference is ST345.0809 and it based on the standard moonwatch but with a calibre 866 and nowadays is calibre 1866 after a upgrade in 1990,s which is basically a calibre 861 with a moonphase / date module added.
This model has a clear clean caseback with the seamaster logo in the middle like many of the other seamaster models. The moonphase does not have the “first watch worn on the moon” engraved or a fancy limited edition caseback as most moon watches do have either. The moonphase was re-introduced around 1999 but with a few upgrades luminova hour markers on the dial not tritium and a modern speedmaster bracelet instead of the vintage 1450 bracelet also they used a modern tachymeter bezel with slight change with a modern font.
I have owned the new and the old moonphase and the vintage one is far better tritium dial lovely patina, and can see this being the one to have as been made in such small numbers, I think a lot of watch brands made watches in the 70,s and 80,s and never realized how nice and stunning they would be in the future.
The speedmaster will always be a loved watch by many collectors and enthusiasts and something will always go down in history as first watch watch on the the moon although there was rumors that Buzz Aldrin did have a Rolex Gmtmaster on his wrist as well as the moonwatch when on the moon, but Rolex was not bothered for the lime light.