Vintage sweatband

[Weatherman]

I have several vintage fedoras that have small holes, single hole, punched in the Sweat Band near the rear seam slash size sticker. I've recently noticed the same type of hole punched in hats that are being sold as new/ notags/ display models. Does anyone know what these holes mean? Fyi, I'm not referring to Kohl's for ventilation or for initials, this is a single hole.

 

[Frunobulax]

It means they were returned to the factory for resale. Sorta like cutout LPs, if you're old enough to remember those.