yes indeed that is a for real camera! over-engineered is somewhat mildly put. It was designed as a military camera and then later models were introduced to the general public.
I had a Rapid M model. With a tack sharp Hexanon lens it was a beautiful camera. Bulky, but no heavier than, say a Mamiya c330 for example. The lever at bottom right is the film advance - a pull/push mechanism with surprisingly large teeth on the gears..
This photo is the Rapid - one version prior to the Rapid M which had interchangeable backs for 120 & 220.
If you're looking for a relatively inexpensive 6x7 with a great lens it's a good choice.
just found this on the Omega 120:
http://www.camerapedia.org/wiki/Omega_120It's impossible to tell what the photo of the woman (w/cam) was taken with - there were so many studio cameras in the 1950s. Likely an 8x10 as Francois said.