Frederique Constant Slimline Moonphase Manufacture vs Seiko Prospex Samurai SRPF03

Frederique Constant's design language vs Seiko's approach

The Frederique Constant Slimline Moonphase Manufacture features a Stainless Steel case at 42mm with Convex Sapphire protection. The Seiko Prospex Samurai SRPF03 offers Stainless Steel construction at 43.8mm with Hardlex Crystal. Both represent their brand's distinct design philosophy and heritage.

Automatic FC-705 (In-House) vs Automatic Caliber 4R35

The Slimline Moonphase Manufacture runs the Automatic FC-705 (In-House) (In-House Automatic Manufacture, 42 Hours power reserve) at 28,800 vph (4 Hz) frequency. The Prospex Samurai SRPF03 uses the Automatic Caliber 4R35 (Seiko Automatic, hand-winding and hacking, 41 Hours reserve) at 21,600 vph (3 Hz). The Slimline Moonphase Manufacture edges ahead on power reserve.

42mm vs 43.8mm — different wrist presence

At 42mm, the Slimline Moonphase Manufacture wears more compactly on smaller wrists compared to the Prospex Samurai SRPF03 at 43.8mm. Water resistance differs: 30m (3 ATM) vs 200m (20 ATM).

Seiko sits in the lower tier

The Frederique Constant Slimline Moonphase Manufacture sits at $2,500–$5,000 and the Seiko Prospex Samurai SRPF03 at $250–$500. On the specs that outlast any price: the Slimline Moonphase Manufacture uses Convex Sapphire with 42 Hours, against Hardlex Crystal and 41 Hours on the Prospex Samurai SRPF03. Service intervals are typically 5-7 years for both.

30m (3 ATM) vs 200m (20 ATM)

The Slimline Moonphase Manufacture is rated to 30m (3 ATM) while the Prospex Samurai SRPF03 handles 200m (20 ATM). The Prospex Samurai SRPF03 offers superior water resistance.