Dunno who really made it -- but after spending a cupla days almost but not quite talking myself into buying one of those Billingham Hadley Pro Shoulder Bag -- I'm almost 70 and having second childhood shopping therapy attacks -- I remembered I had a Canon-brand bag I bought about 30 years ago down in the basement keeping the floor under the darkroom table from getting dusty.
Yup, same dimensions as the Billingham, not quite up to spec as far as materials goes, but the shoulder strap is the perfect length, the leather of the buckle straps is real and still doing fine, the nylon clasps haven't broken yet (and if they do I know a guy who can replace them), and it's got lots of padding and a firm floor. The dividers were even still in it -- laying on the bottom when not in use.
And this has more exterior and interior pockets.
So I guess I just saved myself $260
I have too many bags anyway -- my ideal walking around street shooting bag is the old Swiss Army gas mask bag.