Built around a 50mm round titanium case, the RM 39-01 pairs a bidirectional rotating bezel — engraved with E6-B slide rule flight computer scales — with a screw-down, screw-locked crown and a scratch-resistant sapphire crystal. A transparent sapphire caseback allows an unobstructed view of the movement within, while water resistance reaches 50 metres.
The skeletonized dial lays bare the mechanical architecture beneath, presenting an oversized date display, a month indicator, and a UTC hand alongside the flyback chronograph registers. Power comes from the self-winding RMAC2 caliber, which incorporates a variable-geometry rotor and delivers a power reserve of approximately 50 hours.
A black rubber strap with a titanium folding clasp completes the configuration, keeping the overall package lightweight on the wrist. This example is presented in excellent pre-owned condition.
