A-3 Mechanic's cap ORIGINAL WWII manufacturer Society Brand Hat Co.

US AAF CAP-MECHANIC'S SUMMER TYPE A-3
SPEC: No.6-287 and AMEND. No.5                                                                                                       
USE: For Mechanics
SIZE: 6-3/4, 6-7/8, 7, 7-1/8, 7-1/4, 7-3/8, 7-1/2
MANUFACTURER: Society Brand Hat Co. USA
DATE: 1942 ???