Hi Liz,
Have looked up your "Two Seas" Flake Cut and the only reference I can find of this brand is in the 1940 Tobacco Trade Almanac. It is registered under (BAT) British American Tobacco-Rowatt &Lyon. BAT was set up in1902 for the purpose of exporting British and American brands of tobacco. Rowatt & Lyon, I assume were Tobacco Wholesalers, although have not been able to trace them up to now. I would say that your "Two Seas" was produced specifically for export although not sure who manufactured it unless someone come up with a sample packet or tin. I would say your sign is about 1905 circa. Hope that helps.
bacco