The Omega Speedmaster Professional Moonwatch is the NASA-flight-qualified chronograph in continuous production since 1957. The hesalite (acrylic crystal) version (3570.50, 311.30.42.30.01.005, and post-2021 3861) is the closest to the original 1969 flight model. Hand-wound chronograph, 42 mm case, twisted lugs, tachymetre bezel.
Used pricing in 2026: EUR 4800-6500 for full-set examples.
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The 1861 movement (pre-2021) is the classic; the 3861 (post-2021) added anti-magnetic certification and minor improvements. Both are excellent.
Hesalite scratches polish out with Polywatch in 5 minutes. Sapphire crystal versions (display back) exist but trade differently and are not Moonwatch flight-qualified.
Avoid units with mismatched box/papers/serial numbers - common faking.