This item has been shown 7 times.
I found 7 vintage punch cards that are from the early 80’s. All of these cards have a “C” punch and that symbol is printed at the top of column 1.
Manufactured by “OEI” which means Office Electronics Inc.”
These items are becoming scarce and having been used makes them
more unique. Note: These cards were produced with a corner cut which
made it easy to see at a glance that all cards are facing the same direction.