In most cases the Public Health Service uniform follows relatively close to the U.S. Navy uniform regulations, and not as often these Army style examples turn up in wartime.
With bronzed finished side buttons, and color to match the Army style winter service dress cap of 1912 Pattern, I believe the teens into the early 20’s is justified. Brown leather visor and chinstrap, and OD gaberdine wool, with a lighter tan/khaki mohair band with black piping on top and bottom (fading some) of band are all in very good- fine condition with light wear and old untouched grim on the edges of the visor. The PHS cap insignia is not hallmarked (screw back- 40mm high).
Makers mark is present, but well worn and difficult to make out. Owner’s initials are dot punched out on sweatband “COP.”
Size: approx. 7 1/4 (no label).
A scarce to find.