1960 -
Sales Flyers -
3M Scotch Brand Magnetic Tape
Comes form a former missile engineer for the US Air Force.
Was employed under this position during 1950's and 1960's, may have continued on afterwards, all the paperwork I have are from that period.
Superb condition. Well cared for. pages are clean and crisp. Looks like it could have been printed recently not 60 years ago.