I've seen this before. There was one on germanhelmetsinc.com a while back in the bargain basement with this description:
"This is a fairly crudely stamped M35 style helmet. The concensus among collectors is that helmets of this type are the so-called "MI6" helmet; designed and produced by order of the British secret service for use in covert operations. I have seen other examples which have liners that are closer to British style. This one appears to have a standard M31 liner frame and split-pins. The air-vent bushings are not missing. In the few exaples of these helmets which I have examined, it appears they were not designed as part of this helmet. There are no markings anywhere on the shell. A fascinating example which is a cross between German helmets and James Bond."
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