Mystery sleeve valve engine (update: Imperia 1900 SS)

At the beginning of the thirtees Imperia developed a new 1900 cc slide-valve engine (1900 SS). The picture shows the sports version. The name of Adler comes up here, while it was mounted in a few Adler frontwheel drive based Imperia sportscars, as well as by Adler constructor Gustav Roehr in three Adler sports cars which were very succesfull in 1934/1935 (to the displeasure of the Adler factory management). (Reference: Oswald-Adler Automoble; Imperia history "Les belles Nessonvautoises")

It does indeed look like an Impéria design, but obviously not a Knight-type sleeve valve.

When Impéria's Matthieu Van Roggen poached FN's chief engineer, Arnold Couchard, he came up with a 1100cc SLIDE VALVE design that employed two separate sliding sleeves, each actuated by its own camshaft. As with Knight engines, the inlet and exhaust ports were cast into the block and the plug was optimally positioned in the centre of the combustion chamber. It rotated anti-clockwise, apparently.

Couchard’s ingenious system had two main advantages: it differed sufficiently from the Knight to escape the high licensing fees enforced by Knight and Kilbourne, while being less costly to manufacture.

Never seen one with twin carbs though. A racing/sports version?

The slide-valve Imperia engine is a well-known answer to a quiz question, I'd say, and is nothing to do with Adler or any other licence-building done by Imperia.
Quote from Georgano: "In 1923 M.A. van Roggen, now in charge at Nessonvaux, came up with his slide-valve 1100 cc 6CV, a small tourer of Panhard-loke appearance."

Hello,
as Imperia built Adler-cars in license from the mid-1930s untill the 1950s, it would fit with the Adler archive material.
Best Regards,
Hubertus

Imperia factory had connections with Adler they build their cars and motorbikes in licence. Maybe the pictures came that way in the Adler archive?

Hello
I have found some years ago such a motor in Belgium ,but not Adler ,IMPERIA.
I selle it at Impéria Museum.
Regards
Charles