The Omega Speedmaster Professional Moonwatch 30th Anniversary Apollo XI (Reference: 3560.50.00) is a highly collectible, limited-edition timepiece released in 1999 to celebrate the 1969 lunar landing. Restricted to exactly 9,999 individually numbered pieces worldwide, it serves as a "stealth classic" among vintage watch enthusiasts. It visually retains the historic aesthetic of the standard Moonwatch but distinguishes itself with an iconic commemorative caseback.

  Unlike standard production Moonwatches that showcase the classic Hippocampus (seahorse) emblem, this variant features a special screw-in commemorative caseback:

1. It is deeply stamped with the official Apollo XI mission patch emblem.

2. It is engraved with Neil Armstrong's legendary first words upon landing the Lunar Module: "HELLO HOUSTON, TRANQUILITY BASE HERE, THE EAGLE HAS LANDED".

3. Each piece features its unique limited-edition production number (XXXX / 9999) engraved into the steel.

4. Case Size: 42mm diameter in brushed and polished stainless steel.

5. Movement: Omega Calibre 1861, a manual-winding mechanical chronograph movement with a 48-hour power reserve.

6. Dial: Classic matte black tri-compax layout featuring luminous hands and hour markers.

7. Sub-dials: Small running seconds at 9 o'clock, 30-minute recorder at 3 o'clock, and 12-hour recorder at 6 o'clock.

8. Crystal: Domed shatter-resistant Hesalite (acrylic), authentic to the NASA-qualified space specifications.

9. Bezel: Fixed stainless steel bezel featuring a black aluminum tachymeter insert.

10. Water Resistance: 50 meters.