Established in England in 1773, Christy's in one of the premier hatters--Don Corleone wore a Christy's homburg in The Godfather!
 
This is a lovely example of their work; a reversible bucket hat that's a lovely tweed check on one side and loden green on the other. No size measurement, but it measures 22 1/2" circumference on the interior, and so is around a size 59.
 
Excellent condition.
 
Asking just $25, boxed and shipped in the USA.