The Focas are very nice cameras. Some are fixed-lens scale focus, while others are interchangeable lens rangefinders.
I've used the Foca Sport II, the Foca (two star) and a Focaflex Automatic. I also have a Foca Universal, which is the final model of the rangefinders.
The Foca Sport II is a fixed-lens rangefinder with a leaf shutter and a very nice lens. The Foca (two star) is an interchangeable lens rangefinder with a cloth focal-plane shutter. This model lacks slow speeds. The Focaflex Automatic is a fixed-lens SLR with an integrated selenium meter that offers trap-needle autoexposure or full manual exposure. It has a unique viewing system.
I have mini-reviews of each camera on my site.
The Foca cameras are easy to use, well made and don't give you any unpleasant surprises. However, the lenses with the Foca rangefinder can definitely benefit from the use of a lens shade.
As always, these cameras are anywhere from 40 to 60 years old and can benefit from service.