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looks like it perforated 2 holes in documented to be attached to folder
I've used them in past
I was a Yeoman in the Navy. Service records used this system. Awards, schools, Orders, Transfers, medical, financial/disbursements, achievements, legal, etc. were placed in individual records and maintained for the duration of the enlistee or officer. If you were a member of the crew when the ship was launched you received a "Plank Holders certificate". Crossing the Equator gained another certificate.
thank you for your service
Thank you Bonnie.
These punches are still being made and used. New, they retail for around $12. to $15.00. I see that yours says to "OIL OCCASIONALLY" but I never did. Oil can ruin type-written documents.