Manufactured by Fex/Indo (France), the Ultra Fex was made in various incarnations from 1946-66. This particular example was made c1956, and has the word "Himalaya" on the tiny plate at the bottom left. Apparently, Fex sponsored a Himalayan expedition in 1951, and began marketing a few Ultra Fex models as such.
This is the earlier version of the Ultra-Fex. Later ones had the shutter release on the body.
I just like the blue part.