**Model**: 3573.50 **Condition**: Excellent (Preowned light signs of wear) **Year**: 2011 **Scope**: Box & Papers **Movement**: Manual **Case Width**: 42mm **Strap Length**: 7.50" **Listing ID**: 220001632 **Price**: Offered at $4,650 shipped. Wire, Zelle, or Crypto [Album](https://imgur.com/a/2oyAlIE) | [Timestamp](https://imgur.com/2uKHCLT) **Our Take** The Speedmaster Professional Ref. 3573.50, commonly referred to as the "Sapphire Sandwich" features a sapphire crystal and an exhibition caseback. At the heart of the watch is the calibre 1863, the famous manual-winding movement worn on the Moon. This watch is in excellent condition, showing minimal to no signs of wear. It boasts impressive timekeeping at -4 seconds per day with a 296 amplitude, and the chronograph functions flawlessly. It has also passed pressure tests, confirming its water resistance. Included with the watch are the original inner and outer boxes, the pictogram, and the original papers dated 2011. Overall, this is a superb example of the iconic Speedmaster Sapphire Sandwich.