Dunlop offered several cylindrical tins. My impression is that the style of yours is 1920s or early 1930s. This is from the 1939 Brown Brothers catalogue.
What were your conclusions on the Romac tin ? No red paint but "Accessories" rather than "Industries" so perhaps a wartime economy tin ? They too had used the cylinder pre-war for the kits that involved larger strips of patching material.
I suspect the former hen as the change from "Motor Accessories" to "Industries" seems to have taken place during the war years. Perhaps as early as 1941.
When I cleared a lot of stuff from the emporium that was Clares motor works in S London there was boxes of those red oxide tins, all empty, all new, I grabbed a few, the remainder got squashed. Who'd a thought they would be of interest one day?
Someone was selling them and some gold coloured ones on ebay for about a tenner a while ago, they are late 40s dated on the outside, I think their value was in the NOS contents including a pair of Romac scissors.