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Movements to compare
Calibre 1 — none — A. Lange & Söhne Calibre L901.0 A. Lange & Söhne calibre L921.4 A. Lange & Söhne L951.1 A. Schild 1130 A. Schild AS 1687/1688 Angelus 215 Ansonia Sunwatch AS 1900 ATO battery-electric clock movement Audemars Piguet 2120 Blancpain 1185 Bovet 15 Breguet 591 Bulgari BVL 138 Bulle-Clock movement Buren 1280 Chelsea ship's bell clock movement Chopard L.U.C 1.96 Citizen 0100 Cortébert Calibre 616 Doxa 11½''' hand-wound family EB 8800 Ebel 137 Elgin B. W. Raymond Elgin Grade 291 Elgin Grade 76 Elgin Veritas English full-plate fusee movement ETA 2824-2 ETA 2892-A2 ETA 6497 ETA 7750 ETA/Unitas 6497 Eterna 1427 Eterna-Matic calibre family Excelsior Park 40 Felsa 690 Bidynator Felssa 4007N FHF 96 Fontainemelon FHF 72 Frederic Piguet 1150 French round (Paris) clock movement Girard-Perregaux 3100 Glashütte Original 36 Grand Seiko 9S85 GUB Calibre 60.3 GUB Spezimatic Hamilton 4992B Hamilton 982 Hamilton 992 Hamilton 992B Hermle 340-020 Hermle 451 chiming movement HMT Citizen-derived manual calibre Hublot Unico HUB1242 Illinois Bunn Special (60-hour grades) Illinois Sangamo Special Ingersoll Yankee Jaeger-LeCoultre Calibre 101 Jaeger-LeCoultre Calibre 920 Japy Frères ébauche Junghans calibre J83 Junghans J80 Junghans W 738 Kieninger chiming movement family Kieninger HTW Lancashire Watch Company lever movement Landeron 248 Landeron 48 Landeron 51 Lemania 2310 (and 861 relations) Lemania 5100 Lépine Calibre (bar movement) Lip calibre R25 Lip R148 Longines Calibre 13ZN Longines calibre 30CH Minerva 13-20 Miyota 8215 Molnija 3602 Movado 95M Nomos DUW 3001 Omega 30 mm calibre family (30T2 and derivatives) Omega 321 Orient 46943 Panerai P.2002 Parmigiani PF701 Patek Philippe 12-600 AT Patek Philippe calibre 240 Peseux 7001 Piaget 12P Poljot 3133 Prim Calibre 66 Raketa 2609.HA Richard Mille RMAC3 Roger Dubuis RD821 Rolex 1030 Rolex 1570 Rolex Calibre 3135 Roskopf Proletaire Sea-Gull ST1901 Seagull ST19 Seiko 6105 Seiko 6309 Seiko 7S26 Seiko Calibre 6139 Seiko calibre 7A28 Seiko calibre 9S55 Sellita SW200-1 Seth Thomas 8-Day Lyre Shanghai A581 Slava 2427 Smiths 0104 Smiths 12.15 Smiths W10 South Bend Grade 227 Synchronome master clock movement Timex M24 Tudor MT5602 Unitas 6497 Unitas 6498 Universal Geneve 215 Vacheron Constantin calibre 1120 Valjoux 22 Valjoux 23 Valjoux 72 Valjoux 88 Valjoux/ETA 7750 Venus 150 Venus 175 Vienna regulator movement Vostok 2409 Vostok 2416B Waltham 1883 Waltham 1892 Waltham Crescent Street Waltham Model 1883 Waltham Riverside Maximus Waltham Vanguard Waterbury Duplex Zenith 135 Zenith El Primero Calibre 2 — none — A. Lange & Söhne Calibre L901.0 A. Lange & Söhne calibre L921.4 A. Lange & Söhne L951.1 A. Schild 1130 A. Schild AS 1687/1688 Angelus 215 Ansonia Sunwatch AS 1900 ATO battery-electric clock movement Audemars Piguet 2120 Blancpain 1185 Bovet 15 Breguet 591 Bulgari BVL 138 Bulle-Clock movement Buren 1280 Chelsea ship's bell clock movement Chopard L.U.C 1.96 Citizen 0100 Cortébert Calibre 616 Doxa 11½''' hand-wound family EB 8800 Ebel 137 Elgin B. W. Raymond Elgin Grade 291 Elgin Grade 76 Elgin Veritas English full-plate fusee movement ETA 2824-2 ETA 2892-A2 ETA 6497 ETA 7750 ETA/Unitas 6497 Eterna 1427 Eterna-Matic calibre family Excelsior Park 40 Felsa 690 Bidynator Felssa 4007N FHF 96 Fontainemelon FHF 72 Frederic Piguet 1150 French round (Paris) clock movement Girard-Perregaux 3100 Glashütte Original 36 Grand Seiko 9S85 GUB Calibre 60.3 GUB Spezimatic Hamilton 4992B Hamilton 982 Hamilton 992 Hamilton 992B Hermle 340-020 Hermle 451 chiming movement HMT Citizen-derived manual calibre Hublot Unico HUB1242 Illinois Bunn Special (60-hour grades) Illinois Sangamo Special Ingersoll Yankee Jaeger-LeCoultre Calibre 101 Jaeger-LeCoultre Calibre 920 Japy Frères ébauche Junghans calibre J83 Junghans J80 Junghans W 738 Kieninger chiming movement family Kieninger HTW Lancashire Watch Company lever movement Landeron 248 Landeron 48 Landeron 51 Lemania 2310 (and 861 relations) Lemania 5100 Lépine Calibre (bar movement) Lip calibre R25 Lip R148 Longines Calibre 13ZN Longines calibre 30CH Minerva 13-20 Miyota 8215 Molnija 3602 Movado 95M Nomos DUW 3001 Omega 30 mm calibre family (30T2 and derivatives) Omega 321 Orient 46943 Panerai P.2002 Parmigiani PF701 Patek Philippe 12-600 AT Patek Philippe calibre 240 Peseux 7001 Piaget 12P Poljot 3133 Prim Calibre 66 Raketa 2609.HA Richard Mille RMAC3 Roger Dubuis RD821 Rolex 1030 Rolex 1570 Rolex Calibre 3135 Roskopf Proletaire Sea-Gull ST1901 Seagull ST19 Seiko 6105 Seiko 6309 Seiko 7S26 Seiko Calibre 6139 Seiko calibre 7A28 Seiko calibre 9S55 Sellita SW200-1 Seth Thomas 8-Day Lyre Shanghai A581 Slava 2427 Smiths 0104 Smiths 12.15 Smiths W10 South Bend Grade 227 Synchronome master clock movement Timex M24 Tudor MT5602 Unitas 6497 Unitas 6498 Universal Geneve 215 Vacheron Constantin calibre 1120 Valjoux 22 Valjoux 23 Valjoux 72 Valjoux 88 Valjoux/ETA 7750 Venus 150 Venus 175 Vienna regulator movement Vostok 2409 Vostok 2416B Waltham 1883 Waltham 1892 Waltham Crescent Street Waltham Model 1883 Waltham Riverside Maximus Waltham Vanguard Waterbury Duplex Zenith 135 Zenith El Primero Calibre 3 — none — A. Lange & Söhne Calibre L901.0 A. Lange & Söhne calibre L921.4 A. Lange & Söhne L951.1 A. Schild 1130 A. Schild AS 1687/1688 Angelus 215 Ansonia Sunwatch AS 1900 ATO battery-electric clock movement Audemars Piguet 2120 Blancpain 1185 Bovet 15 Breguet 591 Bulgari BVL 138 Bulle-Clock movement Buren 1280 Chelsea ship's bell clock movement Chopard L.U.C 1.96 Citizen 0100 Cortébert Calibre 616 Doxa 11½''' hand-wound family EB 8800 Ebel 137 Elgin B. W. Raymond Elgin Grade 291 Elgin Grade 76 Elgin Veritas English full-plate fusee movement ETA 2824-2 ETA 2892-A2 ETA 6497 ETA 7750 ETA/Unitas 6497 Eterna 1427 Eterna-Matic calibre family Excelsior Park 40 Felsa 690 Bidynator Felssa 4007N FHF 96 Fontainemelon FHF 72 Frederic Piguet 1150 French round (Paris) clock movement Girard-Perregaux 3100 Glashütte Original 36 Grand Seiko 9S85 GUB Calibre 60.3 GUB Spezimatic Hamilton 4992B Hamilton 982 Hamilton 992 Hamilton 992B Hermle 340-020 Hermle 451 chiming movement HMT Citizen-derived manual calibre Hublot Unico HUB1242 Illinois Bunn Special (60-hour grades) Illinois Sangamo Special Ingersoll Yankee Jaeger-LeCoultre Calibre 101 Jaeger-LeCoultre Calibre 920 Japy Frères ébauche Junghans calibre J83 Junghans J80 Junghans W 738 Kieninger chiming movement family Kieninger HTW Lancashire Watch Company lever movement Landeron 248 Landeron 48 Landeron 51 Lemania 2310 (and 861 relations) Lemania 5100 Lépine Calibre (bar movement) Lip calibre R25 Lip R148 Longines Calibre 13ZN Longines calibre 30CH Minerva 13-20 Miyota 8215 Molnija 3602 Movado 95M Nomos DUW 3001 Omega 30 mm calibre family (30T2 and derivatives) Omega 321 Orient 46943 Panerai P.2002 Parmigiani PF701 Patek Philippe 12-600 AT Patek Philippe calibre 240 Peseux 7001 Piaget 12P Poljot 3133 Prim Calibre 66 Raketa 2609.HA Richard Mille RMAC3 Roger Dubuis RD821 Rolex 1030 Rolex 1570 Rolex Calibre 3135 Roskopf Proletaire Sea-Gull ST1901 Seagull ST19 Seiko 6105 Seiko 6309 Seiko 7S26 Seiko Calibre 6139 Seiko calibre 7A28 Seiko calibre 9S55 Sellita SW200-1 Seth Thomas 8-Day Lyre Shanghai A581 Slava 2427 Smiths 0104 Smiths 12.15 Smiths W10 South Bend Grade 227 Synchronome master clock movement Timex M24 Tudor MT5602 Unitas 6497 Unitas 6498 Universal Geneve 215 Vacheron Constantin calibre 1120 Valjoux 22 Valjoux 23 Valjoux 72 Valjoux 88 Valjoux/ETA 7750 Venus 150 Venus 175 Vienna regulator movement Vostok 2409 Vostok 2416B Waltham 1883 Waltham 1892 Waltham Crescent Street Waltham Model 1883 Waltham Riverside Maximus Waltham Vanguard Waterbury Duplex Zenith 135 Zenith El Primero
Side by side
Specifications
Field Zenith El Primero Maker zenith Country Switzerland Period 1969 to present, with interruptions Diameter Approx. 30 mm depending on generation Height Approx. 6.5 mm Jewels 31 (typical) Frequency 36,000 vph (5 Hz) Power reserve Approx. 50 hours Winding Self-winding, integrated column-wheel chronograph Setting Pull-out crown Escapement Swiss lever Balance High-frequency balance with Nivarox-type hairspring Complications Column-wheel chronograph, Date Architecture An integrated automatic chronograph running at an unusually high 36,000 vph, giving 1/10-second chronograph resolution; launched in 1969 in close competition with other automatic chronograph projects and narrowly escaped destruction during the quartz crisis.
