Ludham is a village and civil parish in the English county of Norfolk, in the Norfolk Broads, at the end of a dyke leading to Womack Water and flowing into the River Thurne. ~Wikipedia.
As can be seen, the building is still there; it’s the central building in the distance, as is the King’s Arms with its distinctive sign framework.
Kelly’s Directory for 1900 lists John Chaplin Junior as the postmaster then. This postcard dates to about 1909 from other ones I have seen. I have a partial postmark: