Hand-carved metal roll dies - photos

[Altair]

Hand-carved metalworking roll dies from the 1930s.

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Previously:

Stamping plant die change - GIF
Metal stamping plant GIF
Chinese female stamping machine workers - GIFs
Thread rolling cylindrical dies - GIF
Roll notch milling - GIF

[NortonDommi]

There would be a lot of mathematics involved in working out the number of repetitions per revolution and vice versa and then a high level of skill required in graving, heat treating and cleaning up. Make the days go fast for sure.

[IntheGroove]

Probably drawn out on paper then cut to determine the diameter of the blank...