First time I hear that name for a Mayser. Very nice hat.Mayser "Libelle" probably early to mid 1950s. Unique thin ribbon / bow combination. Sold by Wilhelm Zeumer (80 years) of Karlsruhe.
Partial View of Mayser Showroom (1925)
There seems to be a good number of hats coming in again for you, Brent. Nice one!