November 23, 2025
H. Moser & Cie. has integrated its highly precise Perpetual Moon complication into the Streamliner collection, pairing it with a self-winding movement in reference 6270-1200. This analysis will deconstruct the engineering, material science, and specifications that define this new timepiece, moving beyond its aesthetic to focus on the technical execution that distinguishes it as a serious piece of horology.
Case Architecture and Dimensions
The Streamliner Perpetual Moon is built on a 40mm stainless steel case with a total thickness of 13.2mm, inclusive of its domed sapphire crystal. The architecture maintains the collection’s signature biomorphic design, with an integrated bracelet featuring meticulously brushed and polished finishing. Functionally, it is engineered for resilience, offering 120 meters of water resistance secured by a screw-down crown at 3 o’clock. A notable addition is the discreet pusher at 9 o’clock, dedicated solely to the precise setting of the moonphase complication, ensuring the case lines remain fluid.
The Caliber HMC 270 and Its Complication
At the heart of this timepiece is the new automatic Caliber HMC 270. This movement represents a significant milestone, as it’s the first time Moser has paired its Perpetual Moon complication with an automatic winding system. Operating at a frequency of 21,600vph (3 Hz), it provides a minimum power reserve of 72 hours. The “Perpetual” designation is earned through its extreme chronometric accuracy; the moonphase display deviates by only one day every 1,027 years. The movement, visible through the caseback, features dark anthracite-finished bridges and a skeletonized solid 18k red gold rotor, showcasing an in-house hairspring.
Advanced Material Composition
The material selection is as deliberate as the engineering. The dial is crafted from a slice of Gibeon meteorite, given a red gold finish and Moser’s signature fumé gradient for visual depth. The hands are fashioned from matching red gold, with Globolight inserts in the hour and minute hands for low-light legibility, while the seconds hand is coated with Super-LumiNova. The use of a solid 18k red gold rotor not only adds aesthetic value but also improves winding efficiency due to its greater mass.
In conclusion, the H. Moser & Cie. Streamliner Perpetual Moon Concept Meteorite is a compelling demonstration of technical mastery. By marrying a hyper-accurate astronomical complication with the practicality of an automatic movement and robust case design, Moser has created a timepiece whose value is rooted in its engineering substance and superior craftsmanship.
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