Apart from the (2?) circular variants most of the "commercials" are traditional MkII shaped...the rim, the liner and the straps are often the give-away.....and to date, frustratingly, I've not found one with any makers stamps. The exceptions, to date at least, are the Head Protectors helmet (bent-down sides), the strange small ridged shell one ("Woolworth"?..although no-one seems to know which commercial helmet actually WAS the Woolworth helmet), the Bakelite "bowlers", the children's ones and of course the Zuck.
And just to add a little context another Dutch Bend 1941 dated Mk II as Produced in Hong Kong by Chiap Hua Iron and Steel works so this technique was as well used by at least one other Manufacture outside of Great Britain...
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