Sellita SW510 BH

Bi-compax automatic chronograph with subdials at 3:00 (30-minute counter) and 9:00 (small seconds), date at 6:00. Based on SW500/Valjoux 7750 architecture. SW510 BH a has date, SW510 BH b is no-date. Uses cam-style chronograph system. Includes 2020 RDM+ barrel upgrade for 62-hour power reserve. Manual-wind version available as SW510 M BH. Used by Christopher Ward, Titoni, and Vandaag. Available in Elaboré, Top, and Chronometer grades.