Originally Posted by
drmoss_ca
I agree that it looks like it might have been been reground, but the extra facet between the shoulder and the tang was known as a 'long cut' shoulder, and was a fashion for a while. I don't have dates for when it was used, unfortunately. So it might just have come that way, but it is so marked that I suspect you're right about the regrind. Here's another Cast Steel, marked J.C. CAST STEEL, SHEFFIELD which shows the long cut, but in a more restrained way:
Great shaver, by the way!
Chris