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Still hard to tell from the pics if an M35 or 40 as the inside of the vent might just be crud and not an insert. But if an insert, most likely apple green as I originally posted.

Andy

Must have posted while you were posting your images. So it is an M40 which rules out the Apple green paint. Perhaps painted post war and now simply lifting? The paint on the outside doesn’t look...

Can you possibly take some clear photos of the vents from the inside of the shell so that we can ascertain if it is an M35 or 40. If an M35, the greenish paint might likely be the remains of the...