Hard Hat Diving

[Cablava]

From the back

 

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[Cablava]

The earliest know MK V is dated 1916.

It is possible that it is an earlier MK I, MK II, MK III & MK IV Morse and Schrader helme

 

[Cablava]

This is a Yokohama hat

 

[Cablava]

From the side

 

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Here are some more of the same hat

 

[eborac]

just for interest's sake. one of the siebe gorman diver pumps as were used in the pearl diving industry in Torres Strait in the 1880's. they were hand-operated ! helmets, if one can still get one, reportedly go for up to AUD$ 10,000.-