Found on Catawiki, a French antique auction website.  Labeled as “Old spirometer, very rare as the scale indicates up to 4 litres while the most popular measure 7 litres.  Origin: Paris, France. Period: 1940 The object is complete and working. No cracks or damage. Window size: diameter cm 18, Object size: ca. cm 12 x 20 cm h 27.”