That is really tiny at 4 pounds 6 ounces. My 28-inch barrel RBL-410 at a fraction of an ounce over 5 pounds is far lighter but much better balanced than my vintage American .410-bore doubles.

I see they are not showing us the barrel flats and watertable so we can judge the proof marks for ourselves. What is the vintage of the gun? The 3-inch .410-bore wasn't introduced until mid 1933. Did the chambers get lengthened when the gun was totally refinished? Is it in proof? A load of 7/16 ounce sounds more like a 2 1/2-inch shell. In the U.S. the 2 1/2-inch shell carried a 3/8-ounce payload until the mid-1930s when it got upped to the half ounce we know today. From American & British 410 Shotguns, Ronald Gabrial, I find the Eley 2 1/2-inch "FOURLONG" cartridge contained a 7/16-ounce load. Hmmm...

I think I'll hold out for the Parker Bros. BHE .410-bore with 32-inch vent rib barrels. Not that my portfolio would ever cover it!!