Vintage Omega GF 494 and GF 568 catalogues

I am developing The Watchmakers App ( https://thewatchmakersapp.com ) and currently started to update the app with early Omega movements from Omega GF 239 catalogue (1926).

When looking for differences between Cal. 17.4 T1, T2 and T3 I found out from this forum that those might be mentioned in another catalogue GF 494 (1936?). I assume I might find helpful info there about other movements too, as it's marketed as supplement to GF 239. So now I am trying to source GF 494 catalogue, if anyone can help me with that, please let me know.



Also I found out that there is another supplement to the GF 239 - the GF 568, also interested in that (but I have no idea about it's contents, if it's about movements, as there seems to be another supplement about the hands). I would be interested to buy the original, but also a scanned copy would be better than nothing.
(Unfortunately I still don't have enough posts to be able to post in WTB section of this forum.)

And another question - does anyone know if there was any other catalogue published before 1926 with information about Omega movements?

On the GF 568 you mentioned: my GF 620-1 (1954) prints the number as GF 548. In the Caliber 30 15p section (p.145, folio 3), parts marked * "differ from those of the basic caliber 260" and appear in catalog GF 548, pages 17 and 18. It's printed the same in all five languages. Photo attached.


In my copy, the parts that differ from the base caliber are sent to GF 239, GF 494, or GF 548. GF 548 is cited at pages 11, 14, 17–21, and 24 for the 23.4 T1, 26.5, and caliber 30 / 30 T1 / 30 SC parts that differ from bases 220 and 260. So it runs to at least 24 pages and may be the same book you're after.


If you ever turn up GF 494 or GF 548, I'd be glad to compare notes. I have GF 620-1, 620-3, and 620-5 here.