How to understand the year of a Heidelberg Windmill?

Hello,
how can I understand the year of production of my windmill?

I can read a serial number on the bottom right side of the press that’s: 111 716 N

Thanks!
Fabio

image: SERIAL NUMBER.jpg

SERIAL NUMBER.jpg

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Thanks for sharing.

Fabio

In the other pictures provided I can see that Fabio’s press is a black ball. I had heard that black ball presses were all pre-WW2 and that after rebuilding their factory, Heidelberg began producing red balls. Is this not the case?

The switchover from black ball to red ball occurred in the 1950s. I was visiting an acquaintance today who has both, actually only a year a part. He told me the dates and I’d like to say 58/59 but perhaps I have the exact years wrong.

He did point out the one difference between the late black ball and the early red ball. A bearing oil hole.

Gerald

Hello Gerald,
can you explain me better, please?

Thanks!
Fabio