The Norfolk Pubs website gives Jim Brown’s dates as 1929–1937. Does that sound right? The bowling green, the airmen, and getting water from the Pit certainly match what we know from other sources.
If you use the search box on the stanhoe.org home page you'll find various reminiscences about the Hero. More photos of the Hero here: https://stanhoe.org/gallery/index.php?/search/174. I don’t think any of those started life as a postcard, so yes please, we’d love a copy of yours.
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My mother had an Aunt Pattie who was married to Jim Brown and they ran the pub in the late 1930's and my mother would visit there.
My mother told me that there was no sanitation inside and that water had to be collected from down the road by using a yoke and two buckets.
She also said that there was a bowling green out the back of the pub and that a lot of servicemen from nearby Bircham Newton Aerodrome would use the pub as there was no NAFFI at the camp.
I have a picture postcard of the pub that was sent to my mother in 1937 if that would be of interest. It is an external view of the pub with a man standing by the doorway