Bulova Classic Automatic 98A139 vs Frederique Constant Slimline Moonphase Manufacture

Bulova's design language vs Frederique Constant's approach

The Bulova Classic Automatic 98A139 features a Black Ion-Plated Stainless Steel case at 45mm with Domed Crystal protection. The Frederique Constant Slimline Moonphase Manufacture offers Stainless Steel construction at 42mm with Convex Sapphire. Both represent their brand's distinct design philosophy and heritage.

Automatic, 21 Jewels vs Automatic FC-705 (In-House)

The Classic Automatic 98A139 runs the Automatic, 21 Jewels (Self-Winding Automatic, standard power reserve) at standard frequency. The Slimline Moonphase Manufacture uses the Automatic FC-705 (In-House) (In-House Automatic Manufacture, 42 Hours reserve) at 28,800 vph (4 Hz). The Slimline Moonphase Manufacture offers a longer power reserve.

45mm vs 42mm — different wrist presence

At 45mm, the Classic Automatic 98A139 has a bolder wrist presence compared to the Slimline Moonphase Manufacture at 42mm. Water resistance differs: 30m (3 ATM) vs 30m (3 ATM).

Bulova sits in the lower tier

The Bulova Classic Automatic 98A139 sits at $250–$500 and the Frederique Constant Slimline Moonphase Manufacture at $2,500–$5,000. On the specs that outlast any price: the Classic Automatic 98A139 uses Domed Crystal with a standard reserve, against Convex Sapphire and 42 Hours on the Slimline Moonphase Manufacture. Service intervals are typically 5-7 years for both.

30m (3 ATM) vs 30m (3 ATM)

The Classic Automatic 98A139 is rated to 30m (3 ATM) while the Slimline Moonphase Manufacture handles 30m (3 ATM). Both offer identical water resistance ratings.