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The Stelo shutter was made by Werner in Dresden in the 1930s. It is an everset shutter, with three speeds, plus 'B' and 'T'. Both the style and the specification are rather similar to the more common Pronto shutter of the same time, although the Pronto also has a self-timer.

Cameras on which Stelo shutters are seen include the Zeca Sport (on which a Pronto may also be seen), and the Richter Reflecta.

An investigation by Daniel Sánchez Torres[1] might indicate that the Stelo shutter did start out as a Stein & Binneweg (Freital, Germany) shutter.