Zenith El Primero

Most Zenith El Primero references take a 20 mm watch strap: 100 of 165. The lug width follows the case size: 38 mm case → 19 mm, 42 mm case → 20 mm, 45 mm case → 20 mm and 46 mm case → 20 mm.

Shop 18 mm Shop 19 mm Shop 20 mm Shop 21 mm Shop 22 mm

Zenith El Primero lug width by case size

165 references measured; 1 more have an integrated bracelet. Updated 2026-10-29.

Case	Lug width	References	Watch strap attachment	For example
38 mm	19 mm · 20 mm on 5 · 18 mm on 2	18	—	03.2150.400/26.C714, 03.2150.400/26.M2150, 03.2150.400/53.C700
40 mm	20 mm · 18 mm on 2	12	—	03.2170.4613/01.C713, 03.2170.4613/02.C713, 03.2170.4613/02.M2170
42 mm	20 mm · 21 mm on 33 · 18 mm on 4 · 22 mm on 2	94	—	03.2040.400/21.C496, 03.2040.400/21.M2040, 03.2040.4061/01.C494
44 mm	20 mm · 18 mm on 2	8	—	03.2050.4026/91.C630, 03.2050.4026/91.R530, 18.2050.4035/01.C713
45 mm	20 mm · 22 mm on 6	18	—	03.2061.405/21.M2060, 03.2066.405/69.M2060, 03.2066.405/69.R515
46 mm	20 mm · 18 mm on 3	15	—	03.2160.4047/01.C713, 03.2160.4047/01.M2160, 03.2160.4047/21.M2160

References that take a different watch strap

03.2150.400/69.M2150: 20 mm, not the 19 mm of most 38 mm cases
03.2150.4069.75.C806: 18 mm, not the 19 mm of most 38 mm cases
03.2150.4069/51.C805: 20 mm, not the 19 mm of most 38 mm cases
03.2151.4069: 20 mm, not the 19 mm of most 38 mm cases
16.2150.4062/91.C760: 18 mm, not the 19 mm of most 38 mm cases
22.2150.4062/81.C753: 20 mm, not the 19 mm of most 38 mm cases
22.2150.4062/91.C752: 20 mm, not the 19 mm of most 38 mm cases
03.2170.4613/01.M2170: 18 mm, not the 20 mm of most 40 mm cases
18.2170.4613/01.C713: 18 mm, not the 20 mm of most 40 mm cases
03.2040.400/26.C496: 21 mm, not the 20 mm of most 42 mm cases
03.2040.400/26.C802: 21 mm, not the 20 mm of most 42 mm cases
03.2040.400/26.M2040: 21 mm, not the 20 mm of most 42 mm cases
03.2040.400/26.R576: 21 mm, not the 20 mm of most 42 mm cases
03.2040.400/53.C700: 21 mm, not the 20 mm of most 42 mm cases
03.2040.400/53.C802: 21 mm, not the 20 mm of most 42 mm cases
03.2040.400/53.M2040: 21 mm, not the 20 mm of most 42 mm cases
03.2040.400/53.R576: 21 mm, not the 20 mm of most 42 mm cases
03.2040.400/69.C494: 21 mm, not the 20 mm of most 42 mm cases
03.2040.400/69.C777: 21 mm, not the 20 mm of most 42 mm cases
03.2040.400/69.C802: 21 mm, not the 20 mm of most 42 mm cases
03.2040.400/69.M2040: 21 mm, not the 20 mm of most 42 mm cases
03.2040.400/69.R576: 21 mm, not the 20 mm of most 42 mm cases
03.2040.4061/01.R576: 18 mm, not the 20 mm of most 42 mm cases
03.2040.4061/52.C700: 21 mm, not the 20 mm of most 42 mm cases

And 35 more in the full list below.

Questions about the Zenith El Primero

Do all Zenith El Primero case sizes take the same watch strap?

No. The lug width changes with the case size: the 38 mm case takes 19 mm, the 40 mm case takes 20 mm, the 42 mm case takes 20 mm, the 45 mm case takes 20 mm and the 46 mm case takes 20 mm. Check your case diameter before you buy.

Can two Zenith El Primero watches with a 42 mm case take different watch straps?

Yes. Of the 94 Zenith El Primero references with a 42 mm case, 55 take 20 mm, 33 take 21 mm and 4 take 18 mm. The reference number decides, not the case size alone.

Every Zenith El Primero reference

Other Zenith families

Inside each one the lug width often changes: it is the reference that decides.

All Zenith families → · Why the size changes inside a family →