42mmLemania Cal. 321: manual-wind column-wheel chronograph, 18,000bph, 48h PR; lateral clutch, triple-hammer; same caliber used on Moonwatch NASA mission1968–1988
40mmRolex Cal. 4030: base Zenith El Primero, modified to 28,800bph (down from 36,000bph), 50h PR, 31j; column-wheel; Rolex replaced El Primero escapement1988–2000
42mmLemania Cal. 321: manual-wind column-wheel chronograph, 18,000bph, 48h PR; lateral clutch, triple-hammer; same caliber used on Moonwatch NASA mission1967–1968
40.5mmPatek Cal. CH 28-520 C FUS: automatic flyback chronograph with second time zone, 28,800bph, 55h PR, 34j; column-wheel, vertical clutch; used in Nautilus 59902014–present
41mmAP Cal. 4401: AP's first integrated in-house chronograph, 32 x 6.8mm, 28,800bph, 70h PR, 40j, 367 parts; column wheel, vertical clutch, flyback, free-sprung balance under a full bridge, 22k openworked rotor; debuted in the Code 11.59 in 2019, reached the Royal Oak chronograph in 20212019–present