Is it possible to date it from this? The barrels are inscribed with ' W W Greener 68 haymarket london & St. Just what is an F4 grade? The serial number is 48914. The gun is a 12 gauge W W Greener non ejector shotgun in F4 grade. Any way now I have joined up I would be very grateful for any information and light on my questions regarding the W W Greener 12 gauge shotgun detailed below. I have tried to read as many topics as I can on this forum to try and learn but frankly while all of it has been absorbing quite a bit of it is beyond me. That was largely because I really have not enough knowledge about shotguns to contribute but only a wealth of questions. This is my first post although I have been a spider on the wall for some time. That's a lot of.Ī very warm hello from north of the Bay of Bengal. W W Greener started making shotguns in 1829 and is still making them today. That is the serial number of the shotgun. The barrel below is Improved Cylinder choked, and has the same serial number as the gun and the full-choke barrel. W.W.Greener's Martini-actioned GP shotgun. Greener designs in 12, 16, 20 and 28 bores. Presently the company makes new 'Exhibition' shotguns using traditional W.W.