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Ive never measured it, its just how it looks to me hence the "about" lol,
As I restored it for me and it shaves great exact measurements dont matter too much just the shave. :)

191430191431191432

Thats my Bengall, T R Cadman&sons, its about 4/8, it was pretty rough when I got it (part of a job lot)

I was making scales for another razors trying something different...