Lens:

f3.5, 40 mm Berthiot Flor, iris diaphragm to f16. Serial no. 1111256 1111315 .

Shutter:

Guillotine, behind the lens, speeds 1 - 1/250, B, T. Flash synchronisation, two sockets for electronic (marked E) and bulb (marked F).

Construction:

Metal body.

Format:

20, 24 x 30 mm stereo pairs on 35 mm film in cassette, or 40 mono exposures. Stereo images are interleaved on the film, i.e. 1st exposure, 2nd exposure, 1st exposure, 2nd exposure .... .

Focusing:

To 2', the lens board moves forward and backwards.

Attributes:

Coupled rangefinder showing central double image. Direct-vision (lens/lens) view-finder.
Film advance by sprocket, also tensions the shutter. Auto-stop on film advance.
Setting for mono exposures. Lever on lens panel to tension the shutter without advancing the film.
Depth-of-field scale, frame counter.

Identification:

Late model with flash synchronisation, depth-of-field scale and separate shutter tensioning lever.

Serial Number:

4860056 .

Notes:

Retailer's label: Duval (when sold second-hand or repaired).

With:

Case.