From the 1900s (likely 1950s or 60s), this is a set of 5 fine sheets of notepaper paired with 5 dark grey envelopes. Paper measures 5.5 x 8.5 inches with envelopes at 4 x 6. The French write the date as Le blah-bitty-blah of whatever month, followed by the year. Now don't you feel smart?!