I checked in O'Brien's "Collecting Foreign-Made Toy Soldiers", and there's a bit of a problem with an ID of Johillco. They did make a sailor marching at the slope, J55A, but he carries his rifle on the right shoulder, not the left. The photo also shows all of the sailor figures in whites. The look of the Johillco sailor's cravat is different, too, it's in more prominent relief than on this figure, and the Hill sailors also appear to have cartridge belts cast on them, around their waists (though not all appear to be painted). His stride also looks a little shorter than Rediarmor's figure's. Also, O'Brien noted that most Johillco figures are marked, most of them as "Johillco", others as "J. Hill" or "Jo Hill". He does note, though, too, that ounly about 80% of Johillco's output is known.
That is the closest ID, though, of any that I've been able to find. Even if it's not a Johillco figure, I think that it's probably from a British maker.
Prost!
Brad