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I see a lot of these mysterious marking codes on very old (e.g. 1980) capacitors by different manufacturers.

frako capacitor

roe capacitor

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  • \$\begingroup\$ Wild guess: production line number. \$\endgroup\$
    – winny
    Commented Sep 22, 2022 at 16:43

1 Answer 1

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Probably (German industry?) standardized case size codes.

Kemet lists these sizes:

enter image description here

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  • \$\begingroup\$ Thank you, probably you are right. \$\endgroup\$
    – Coriolanus
    Commented Sep 24, 2022 at 19:18

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