Please note that due to long-term storage, there is discoloration, loose threads, and traces of stickers (inside the brim), so please check the photos before purchasing. The size is written as 56cm, 6 7/8 inside. Measured with a tape measure, the long side of the oval inner dimension was approximately 19cm and 16cm. (See photo) #BoaterHat #BoaterHat #Retro #Antique #Vintage