This from a reply to a question long ago on another forum far, far away about how I got involved collecting El Primeros:
In answer to your question, more or less by coincidence. I stumbled across one by chance, offered by a clueless estate jeweler for a giveaway price and bought it on the strength of its visual appeal. Of course, I had heard of the "El Primero" at the time, but no more than that. Once I had the watch in hand, I started to educate myself (, and the more I learned, the more I found to like. There's
1. the name, which to my ears sounded almost tongue-in-cheek, like a masked mexican wrestler (that's a positive to my sensibility)
2. the great story and enduring controversy of the race to the first automatic chronograph between Zenith, Buren-Breitling-Hamilton-Heuer and Seiko
3. the even greater story - as close to epic as a watch story can be - of the courageous single-handed Saving of the El Primero during the dark quartz years by the intrepid watchmaker Charly Vermot
4. the amazing longevity of the movement itself - still in current production with minimal change 41 years after its introduction, and still among the best movements you can get
5. the quality - sought after by Panerai, Rolex, Parmigiani, Concord and others for use in their own pieces.
6. the instant visual appeal and variety of the watches themselves
7. the chronograph + date function
8. the high-beat chronograph seconds sweep - smoooooth. Maybe that's trivial, but I find it to be nice visual reminder of the machine within.
9. the power reserve which laughs at lesser engines
10. the amazing precision
11. the reliability -- I am still in awe of this. 40 year old movements, at least two of which sat in a drawer for decades, all run at 36000 BPH with excellent consistency and power reserve - all you have to do is strap them on. I have 10 of these, and none have ever given me a moment's trouble (yet -- I know, but it still impresses me)
In brief, layer upon layer of fascination that continues to unfold.
Or it could have been my subclinical OCD.