Seiko Prospex SPEEDTIMER Seiko Brand 100th Anniversary SPEEDTIMER Limited EditionvsTAG Heuer Formula 1

The Prospex SPEEDTIMER Seiko Brand 100th Anniversary SPEEDTIMER Limited Edition is praised for its retro design, balanced 42mm case, good finishing, and sapphire crystal. It is powered by the calibre 8R48, featuring a column wheel and vertical clutch, and offers 100m water resistance. Some find its 45-hour power reserve short compared to modern alternatives, and the date window placement is a point of discussion. The solar-powered variant is noted for its compact proportions and character, though some desire thinner cases and improved bracelet micro-adjustment. Overall, owners and reviewers appreciate the SPEEDTIMER's vintage-inspired aesthetics and solid build, with critiques focusing on power reserve and minor functional details.

Owners widely praise the TAG Heuer Formula 1 for its addictive wearability and the appealing double date windows, with one owner considering it a favorite purchase. The stopwatch function is noted as fun and easy to recalibrate, though the alarm function is considered a potential gimmick by some. One owner found battery replacement challenging and desired a movable bezel. Overall, owners rate the TAG Heuer Formula 1 highly for its engaging features and satisfying ownership experience.