Hello,
I agree on the tractor. Looking a second time it seems as if the crew are wearing white shirts and ties under the overalls.
But the gun. No, it doesn´t look like a French soixante-quinze to me. The mussle, breach, shield and wheels does not fit in to a French M/1897 75 mm.
It looks as if the breach is of the vertical Krupp-type. I still think this is close to a Dutch 75 mm modernized M/1903.
Could it be a demonstration in NL?
Enclosed: A Citroen-Kegresse halftrack towing what I think is a French 75 mm. Nothe wheels and the rather short shield. The gun is loaded on a sprung rubber tired bogie.
Stellan