Rooted in Breitling's 1960s racing culture, the Top Time B21 reference NB21251A1L1X1 brings that spirit forward in a 43mm round bronze case. Bronze develops its own character over time through natural oxidation, giving each piece a gradually evolving appearance. A fixed bezel, scratch-resistant sapphire crystal, and water resistance to 100 meters round out the case's practical credentials.
The green dial is fitted with index hour markers and luminescent hands for clear readability across varying light conditions. Inside runs a self-winding mechanical movement — the B21, developed in collaboration with La Joux-Perret — operating at 28,800 vph with a 55-hour power reserve and 30 jewels. The chronograph function offers 1/4-second timing resolution and a 60-minute counter.
The watch is presented on a brown calfskin strap secured by a fold clasp, and this 2025 example is unworn and accompanied by its original box and papers.
