The only Bengalls I have that I'm reasonably certain are pre 1890 don't have any maker's marks at all. Just when they started to put "TR Cadman" on them I'm not sure; it may have coincided with the export-related need to add "Made in England". The difficulty in deciding these issues is compounded by the lack of early examples firmly attributable to the Cadman factory. Keep looking folks, we need more razors!