Model 1937 offensive was made of 2 sheet metal halves, and had an Mle1935 fuze fitted.
Paint schemes were changed after ww2, see

Total height : 95mm
Diameter : 60mm
Weight :
Filling :

Photos below © Evgeny (ww2 made)

Above, on the left: a live postwar model and two blue training models (middle and right) who contained a chalk powder filling. The fuze shattered the body and the chalk would visualise the blasteffect.
Three photos above ©
Paul Spence (All these photos represent post-ww2 OF37's, see page)

Photo below © B. Bosman
also a training model

Produced before WW2 :

Photos Rick.