Thanks. As far as I know they started to stamp their blades with cutlers to HIS majesty from 1901. I think the G in the crown might refer to George V, which would put it between 1910-1936.
Joseph Rodgers was a well known, well established Sheffield maker. They made a variety of knives and cutlery, from ornate stag-handled silver-bolstered stuff, to simpler daily use stuff. According to the links below, Rodgers' use of the cross trademark dates from 1724 (though registered in 1764). https://www.sheffieldcollectableknives.com/about/joseph-rodgershttps://www.hawleysheffieldknives.com/n-fulldetails.php?val=r&kel=362The G+crown+R would be George, though I'm not sure how to tell if it was George V (1910-1936) or George VI (1936-1952). Joseph Rodgers also seems to play fast and loose with the "R" stamp. Here's a faded one--but the one on the knife in this thread just looks like a "P"
I wouldn't necessarily try to get rid of the frown. It is a slicer so no reason why the frown would really hurt you much in use. It's not really a material defect in this case and I hate t o waste unnecessary antique steel. No need to worry about accordion cutting peppers because you won't ever use this as a board knife. I would just put a nice fresh bevel on it and use it for slicing roasts and steaks. Nice find!! Joseph Rodgers is also one of my favorite Sheffield straight razor manufacturers.
I would vote for George V. And say it's about 100 years old. But that's just my gut based on how the mark appears to be stamped.
Hey, I love some of the carving kits he made, they are truly one of a kind! Lost the opportunity to ger one from the Victorian era a couple years ago and regret that decision ever since!