Two-piece British open comb - looks to be a #77/#88 (only the case differs). I have a #88 with the metal case and I think it's the same but will check.
Can't tell if it's silver or nickel. There is slight plating loss on the top of the head and also in the fist picture of the razor by itself. I see the brass underneath the plating.
Any way of knowing how to check to determine whether it is silver or nickel?