I'm not an expert on these things but it looks like a C Type helmet. Are there any stamps inside or crowsfeet? If there's a 22C/ prefix to any numbers, then that's an RAF s'exual preference' (section ref. no.).
I think I can see stitch holes where the ear cups once were. My guess would be that they were removed, a piece of leather sewn over the holes and the helmet used on a motorcycle post war.
There should be a number and possibly a broad arrow stamped into the leather on the outside near the chin strap.
I believe it is a later C-type pattern with no internal wiring
Value in this condition I guess about 30Euro.
Regards, Luc
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