From my Samples, Singulars, and Somethings Completely Different collection -

A special order kettle helm made by GDFB (Get Dressed For Battle). These are no longer made and were never regularly commercially available in the U.S., but a couple of years ago I imported a selection of them and kept one for myself. It now can be yours! 14 gauge steel, leather suspension liner and chin strap.

brim, front to back: 15"
brim, side to side: 12 1/2"
height: about 7" (eyeballing with a vertical ruler, kinda tough to call)
brim: 3"
inner circumference: 26"
weight: 5 lb 12.5 oz