Unidentified Omega chrono at Fellows

This chrono with Omega on the dial is on auction/for sale at Fellows https://www.the-saleroom.com/en-gb/...0585/lot-0e05589e-1ba8-4fa3-95de-ab6500c74989
or
https://www.fellows.co.uk/2517-lot-...e=&sub_cat=&utm_source=&view=lot_detail&year=
According to the description there's what "appears to be a modified Tissot calibre 872 (Lemania 1277) with Omega parts added" inside.



The previous owner has managed to wipe/polish away the Omega logo on the crown



The case has similarities with a 2998 but is asymmetrical.
There's a broad arrow hour hand but only 2 subdials.
Only a printed logo.
Second hand looks too long for my taste.
I can't find any Tissot with this kind of case. (in Wilko's pdf that's linked somewhere on the Forum)
What is this? Another "prototype" or another hodepodge?

Having had some closer looks I'm pretty sure this is not Buzz Aldrin's Speedmaster.

Tbh looks like an Lemania case

Case looks very similar to the Fab Four chronos?