1966 Crosshair 168.005 561 vs 564

Both 561 and 564 cal in gold 168.005 per Desmond’s reference chart see below.

The watch you asked about has 23 mil SN with 561 cal. Which dates to 1966.

I think you need SN of specific watch to get date idea, rather than just dial config and ref.

But I would say 564 cal in such a watch would be possible as 564 may have been introduced as early as 1965 and my understanding is there was lot of overlap between 561/564 in 1966.

Here’s a 1966 SS watch with 564.


http://omega-constellation-collecto...yfind-calibre-case-number-date-index.html?m=1

Welcome @Omegawes

Omega was transitioning from 561 to 564 in all of its Constellation references around 1966/67 (not just the doglegs).

As @SOG53 says, a 23m could easily have a 564 movt (in fact it looks like 23,8m so could even be a ‘67 watch)

The case material won’t affect the movt used ( 561/564) so if you found a gold capped watch like the one you linked to, with a 564 and even that serial, it should raise no concerns.