Omega Seamaster ... ¿Cosmic?

And that’s your information right there. 166.026 is indeed a Seamaster Cosmic - the reason yours doesn’t say so on the dial is because someone cleaned the dial of the original print, painted it white and wrote Omega Seamaster Automatic on it - it was “redialed”.

Exactly. It’s not uncommon, unfortunately, as to collectors it removes much of the originality and thus value.

It’s your watch and if you like it that’s all that matter. But since you mention it, allow me to be frank: To my eye, this is a rather unfortunate redial job that has nothing to do with the font and delicacy of the original. They didn’t even include the original model name. Many of us here have seen hundreds and thousands of dials and the eyes get trained over time. I’d say this is a redial that’s very easy to spot for the group of nerds here. 😀 Another clear indicator is the lack of “Swiss Made” at the 6 o clock position of the dial by the way.

Please don’t let this put you off of your watch though - in the wild (e.g. on your wrist, wearing it every day), nobody will ever notice.

There is a very good thread here dealing specifically with redials. Do a search and have a look. I’m just a collector who enjoys watches I’m very far from an expert and I don’t posses the knowledge many here do but I can tell you In all honesty it doesn’t take a lot of time to gain the knowledge to pick out redials vs originals.