The top plate has a film advance lever on the right (this was introduced on this model, earlier models had an advance knob) which incorporates a frame counter which counts down to zero. This moves through about 180 degrees to advance the film one frame. The lever is not on a ratchet and so cannot advance the film with a number of small strokes (c.f. Wirgin Edixa 1).
|Retina right, Retinette left|
|Retina Ia left, Retina I right|