This vintage cap was made by Plymouth caps. It is unlined and was probably sold as a summer cap, with seven large ventilation grommets behind the brim. It has taped seams and a leather sweatband.
This vintage eight panel work cap was made from denim, with unlined construction, taped seams and a brim with concentric stitching for rigidity. With an absence of a snap on the brim, and a plastic rivet to the center inside, I’m leaning toward a date of manufacture in the 1960s, though the proportions and small button on top give it a very passable ’30s look. The cap best fits between a 7-1/8 and 7-1/4.