If it is made like my Rainbow Fly-Back,
1.step push the bars through. In other words, they are not spring bars. Actually, you can tell because if they push in but then “spring” back, they are spring bars. That should not be the case though.
But I will ask you to exercise caution. There are some tubes that hold the bar in place via a dimple (they are located in the endpiece). When you remove the bracelet, work over an area that lets you catch those tubes in case they fall out!
( You can use 20mm spring bars to attach your strap)
dan
Another thing that makes the El Primero special:
Despite the fact that it was produced by Zenith alone against fierce competition by a consortium (Breitling/Hamilton-Buren/Heuer-Leonidas/Dubois-Depraz) to get the world’s first automatic chronograph on the scene, it was also designed to have a date function. This might seem normal to us nowadays, but in 1969, it was anything but the rule. There were few chronographs of any kind with a date window before that (some examples by Landeron and Hanhart that I know of) - most had nothing and some Valjoux ones had a central pointer date, which interferes a little with the chronograph second hand legibility. So, not quite a first for the EP but it seems to have been a little bit of a trend-setter in that regard - after it came on the market, practically all chronograph movements were designed with it!
Hartmut Richter
