Vintage 1950s Ihi Sunproof Hat Military Pith Sun Helmet Khaki

I've seen this style of Pith attributed to all of those generations, but I do not know how to find a definitive date.

Vintage U.S. Khaki Pith Sun Hat / Helmet with chin strap and liner brackets

Vintage Pith Helmet

Pith Helmet, US unissued New Pith Hat 1960s - Omahas Army Navy Surplus

Vintage Pith Helmet

Rothco Campaign Hat: Military Apparel Accessories: Clothing, Shoes & Jewelry

Genuine US Military Vietnam war Era Pith Safari Sun Hat Waterproof

American 47th New York Summer Sun Helmet 1800s . HU1068 - Time Traveler Militaria

LIBERTY MOUNTAIN Pith Helmet (Khaki) : Clothing, Shoes & Jewelry

British Empire Pith Helmet - Khaki

VINTAGE MENS PITH HELMET SUN SAFARI HAT MADE INDIA SIZE 7 1/4 British Khaki

Vintage 1950s Ihi Sunproof Hat Military Pith Sun Helmet Khaki Drill India Safari