It is small with a crown 6 inches high ,; inside measures  6.5 across and 8 inches end to end .

Inside circumference-51 cm

Across inside-16cm

Length inside; 18.5

The photos show what appears to be very slight "dishing " of the crown-this would not show when worn or on a hat block.

It comes complete with a metal hat box,  laquered inside and fairly battered showing its long used life.

The hat is immaculate and would be ideal for steampunk, drama , cosplay etc