Speedmaster Ultraman Serial Number Ranges?

All, curious on Ultraman serial number ranges. I've seen some older posts / resources (https://speedmaster101.com/blog/ultraman-resource-page/) indicating serial ranges in 26,076,xxx-26,079,xxx but I'm not sure if that is old information and how strict the serial range should be. Meanwhile I've seen other listings / websites indicating ultramans outside of this range (ie., earlier serial ranges 26,071 / 26,073, 26,074, etc). Here is a list with an example from auction an auction from Bonhams as well:

https://www.watchfid.com/omega-speedmaster-ultraman/
https://www.bonhams.com/auction/276...ltraman-ref-st-145012-produced-16th-may-1968/

I guess my question is, without EoA now, I don't know if we'll ever be able to get confirmation from Omega themselves but are the ultraman strictly in the 26,076,xxx-26,079,xxx serial ranges or can the watches have serial numbers as early as the 26,071 / 26,073, 26,074 serial numbers as indicated in the watchfid site?

Are you referring to the satin black dial for the UM? Do they all need to have the satin black?