Chuck Griswold was a commercial diver and engineering consultant on various diving projects. Besides this Chuck was an inventor that created his own diving helmet. Between 1971 and 1995 the Griswold helmet was made in iron, brass and aluminum. Today only a number of 11 helmets are known to still exist (1 iron, 8 brass and 2 aluminum). How about this for a rare helmet.

Griswold helmet in brass. The diver can control the amout of air coming into the helmet. 
Front side of the breastplate has GRISWOLD BOSTON cast on it. 
The patent number is stamped in at the rear. Photo courtesy of Leon Lyons.

Griswold helmet in iron. The diver can control the amount of air coming into the helmet.
Front side of the breastplate has GRISWOLD BOSTON cast on it.
There is no patent number stamped in at the rear. Photo courtesy of Leon Lyons.
 
Chuck with his lovely wife Joyce on Puget Sound. Chuck and friends after a sport dive - Puget Sound.
These photos are courtesy of and thanks to Guy Score from Duvall Wa.
Chuck was Guy's best friend and mentor.

Can you contribute the aluminum helmet?
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