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Back to the question. After looking at few dozens of razors it looks to me like they were either cut like old style hand made files or roled with toothy roller.

Are you sure that we talk about same thing?

Hmm. Have you tried to shave with blade without jimps and one with jimps? How was your grip and controll of the blade?
I love Sheffields but unfortunately often those old ones do not have jimps...