IBM 704 reference card
||TSX 156, 4
||Number is the 1st number in a sequence of numbers under the phrase "Entries to core dump and supervisory program". Upper left corner of card.
overall: 1/8 in x 5 1/4 in x 3 1/4 in
This card came with a piece of paper that read "704 Card". This card bares the signature of Robert Brubaker.
Courtesy of Bob Brubaker