Numbers produced of different Speedmasters?

I can't recall whether this has been done for the -69 (one of the most common of the collectible Speedmaster references), but MWO made an effort to estimate production numbers for the various cal 321 references. Some of their data are online, updated information can be found in the print books.

https://www.watchbooksonly.com/arti...view-of-the-speedmaster-moonwatch-production/

I think you will find that rarity may not be quite as important for valuing watches as for stamps and coins. Some watches that were made in very large numbers have nevertheless become extremely desirable. And of course there are innumerable examples of rare vintage watches that are not as valuable as you might expect. In fact, when very few of a particular watch were originally made, the reference sometimes does not have the chance to really develop a following in the collectible market because it is so hard to find, and you don't see photos of them all over IG.

Don’t forget the ref the OP asked about is an 861 movement model so is in fact one of 100s of thousands. The -69 will certainly be more limited than that but won’t be a trivial number. If you want rare then I would expect the -76 or -78 would be an order of magnitude less numerous since by then the Moon pixie dust had worn off and the quartz crisis had taken hold. Rare doesn’t always equal valuable of course.

The upper limit would be 3.2 million, but the actual amount is lower since cal. 861 movements were used for watches other than 145.022 Speedmasters.

Rarity and collectibility don’t always align…

Example the most rare bezel version with the 220 error carries little to extra value. In coins it would be through the roof.

doesn’t the 3.2 mil include all Omega watches from 1969 to 1971 (?), not just chronographs? The share of Speedmasters is way smaller.

Doh, sorry, you're right, not just cal 861. All Omegas. 🤦