It seems that back in the 50s and 60s (maybe before that as well) businesses used these sorts of things as promotions to impressed the little missus when she tagged along with the big guy to buy insurance or auto parts or whatnot.
"Here little lady, go home and darn some sock for your man and rest assured that everything is being taken care of and your life is one of clueless safety!"
And although this "Sinclair" three-&-a-bit-inch combination ruler and 1965 calender is gender neutral it's also essentially useless and appears to of found it's post 65' use as a needle or pin holder (note the holes.)
