I'm quite sure that it is out of a frequency counter. Probably the least significant digit (LSD) or second least significant digit. You might try looking at the old Hewlett Packard model 524 frequency counter. I  think you find it quite similar.

Good luck,  Irv.


On 11/12/2025 3:58 PM, 'Oskar' via neonixie-l wrote:
I recently acquired this large 1MHz decadic counting unit but haven't been able to find any datasheets for it. If anyone has information on how to get it working, I'd really appreciate the help.

/Oskar
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