zOwie Omega Discussion Forum

Some had tritium lume, others no lume. By the point these were made Omega had more or less completely adopted the convention of marking luminous watches with 'T'.

Catalog images courtesy Steve at www.old-omegas.com:

The earliest (1968-early '70s) used 56x and 75x movements that were essentially non-chronometer version of the movements used in the high-end lines like the Constellation; later models used 10xx movements that weren't as nice. Later ones also had varying case shapes and finishes, with some polished and/or gold plated; others that are sometimes seen are simply overpolished but used to have brushed finishes.

As oyu can see the straps/bracelets have a fairly unique design, but there are aftermarket straps available online. Omega genuine corfram straps are also available from suppliers like Otto Frei.

Here's one I used to own that's gone on to a new home recently, from the earliest type:

If you've taken a liking to them, you can still get good deals as the unique styling keeps many away and has largely discouraged fakes and frankens, though over-polished and incorrectly restored examples are out there.