Under the Hood of Patek Philippe's Sky Moon Tourbillon

JX Su provides a look inside the Patek Philippe caliber R TO 27 QR SID LU CL that powers their double-sided Sky Moon Tourbillon references 5002 and 6002. A multi-layered movement consisting of 705 parts.

The movement of the Sky Moon Tourbillon is essentially a combination of three familiar calibres. At its base is the R TO 27, a hand-winding movement with tourbillon and minute repeater launched in 1993.

Add on a perpetual calendar module and the result is a movement with minute repeater, tourbillon, and retrograde perpetual calendar.

The last piece of the puzzle is the sky chart from the Celestial refs. 5102 and 6102.

While these references are loud, in both the literal and figurative sense, Patek Philippe's sky chart remains one of the most sublime in the industry.

Image credit JX Su