modification to ETA movements

Hello -
I have a new Aquatimer 376711 which I believe has an ETA 7750 movement. I've read a couple of conflicting accounts about modifications (if any) by IWC. Some accounts say they are heavily modified by IWC and set to "higher standards" (not sure what that means). Other accounts say the movements are finished by ETA these days and not modified at all. Just curious which view is correct? Thanks. BTW, I'm just curious about this as I could not be happier with the watch; it's brilliant.

I quote from a similar post on May 28, 2013, when our Moderator, MF, advised reading the following:
www.iwcforum.com/Movements/IWC_Calibre_7xxx.pdf
www.iwcforum.com/Uhrenjournal.html

That was interesting reading.

I enjoyed learning about ETA movements and what IWC does / did with them.

Thanks. Appreciate the links.

thank you Dave, those were quite informative articles about the art of IWC!

This is a good read for when IWC actually touched the 7750 ... These days the movement is completely assembled by ETA .. I believe ETA has just adopted a lot of IWC's modifications in their top grade ETA movements now .. I could be wrong with that, but, that's my understanding..

Good reading! Now I finally know why my 3712-07 has a cal76240... and where the number actually comes from!