Reference 331.12.42.51.02.002 houses the action in a round stainless steel case measuring 41.5mm in diameter and 16.5mm thick, sealed against water to 100 meters. A fixed bezel frames the silver dial, while an anti-reflective scratch-resistant sapphire crystal ensures clear legibility in virtually any light. The transparent case back offers a view of the movement within.
Power comes from an automatic Co-Axial movement carrying COSC chronometer certification, driving a chronograph complication with the precision that underpins the Speedmaster name. The movement's COSC status confirms it meets the stringent Swiss official timekeeping standard.
The brown calfskin leather strap fastens via a deployant buckle, lending a vintage-inspired character that complements the Speedmaster '57's heritage-minded design. No screw-in crown is fitted to this reference.
