I have a Kodak Retinette type 030, which looks to be in good condition. Pictures below.
By this, I mean that it is very clean for its age. The film forward and rewind work well and are smooth. As is the shutter button and the film transport. Even the self-timer work well.
On the front of the camera, around the lens, the aperture dial turns very smoothly and the aperture blades open and close smoothly also. I can also move the shutter speed dial, but whatever setting I put it on, the shutter appears to fire at the same speed at all times (apart from Bulb).
However, the focus/distance dial is stuck solid and won't budge.