At the left under the tab on the back is the date code 2/72, for February 1972.
These hinges have square corners and are not folded. I fold them in half in small units of two, three or four and cut them in half vertically and use as half hinges because they do not peel well.
They are OK, but they are not the great old Dennisons with rounded corners that I remember from the 1950s.
