The 1863 Moonwatch. Sapphire both sides, the decorated movement, the lowest price here.

The Moonwatch is the Speedmaster Professional, the hand-wound chronograph NASA qualified for spaceflight in 1965 and Buzz Aldrin wore on the Moon in 1969. Its shape has not changed: a 42mm asymmetric steel case with twisted lyre lugs, a black tachymeter bezel, a black dial with three sub-dials, and a crown between two pushers. What Omega changes, every couple of decades, is what is inside and what is on top. The 1863 is the 1861 built to be seen: the same Lemania-based hand-wound chronograph with rhodium-plated bridges and finishing, fitted to the references with a sapphire caseback. This is one of them, on leather, with a domed sapphire crystal in front as well, so it is the previous generation’s equivalent of the sapphire sandwich watch on this page.

The seller says it comes in the big Moonwatch presentation box that Omega supplied in those years, with a loupe for the caseback, spare straps and the tool to change them, which is worth asking them to confirm because that box is part of the value. Omega no longer lists the reference; this is a seller’s stock, and it is the least expensive Moonwatch here.

This is a regular Amazon listing from a marketplace seller with Amazon’s 30-day return window; it is not a Luxury Stores pre-owned unit and the seller has not published a condition. The second button opens the live search for sapphire-back Moonwatches on leather in case this one has sold.

Speedmasters have resold for under new and close to what pre-owned buyers paid, sometimes more, sometimes less; that is a pattern, not a promise, and nothing here is investment advice.