were you able to find one in the US? I wouldn't say they are rare in the USA, but definitely fewer buying opportunities on our side of the Atlantic. Apparently, the Clack was imported into the US and sold under the name of Agfa Weekender, but I've never seen a used one for sale under that name. When you move the lever on yours to the "sunny" position do you get a yellow filter or a smaller aperture?
Yes, I did find a very good condition one for $70, a lot more than they were going for years ago I guess. It has the yellow filter. I tried it out yesterday, it made a "fat roll", so I've tried bending the metal piece by the take up spool a bit and hope it fixes it.
30mm push-on, good to know.
Look at the difference between these two cameras: same negative size, almost same focal length. And that's not even mentioning the weight difference of around 5 pounds!