The German Certo Company made folding cameras in a variety of formats before and after the Second World War. The top of their line was the Certo 6 which brings a substantial price today from collectors. My first pre-war Dolly Supersport was not in the Certo 6 league, but it was solidly made with an attractively tooled leather covering and sturdy leather bellows. The big, old Compur shutter had speeds from 1 to 1/250 seconds; it was a little noisy because of the size, but reliable and accurate. The lens was an uncoated 75mm f2.9 Meyer Görlitz Trioplan; it was subject to flare if pointed anywere near the sun, but capable of very good sharpness if properly used.
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