The top image says it was issued April 6, 1928, while the bottom one says April 6, 1927. Are these two different documents issued a year apart, or is there a discrepancy?
The top picture is the actual Private Pilot "license" that "expires" on April 6, 1928. The bottom picture is a "Pilot's Identification Card" that was "issued" on April 6, 1927, without an expiration date, and accompanies the Private Pilot license.
It appears that the Pilot's Identification Card and the actual Private Pilot license were issued as a pair at the same time.
(highlighting is mine, picture source is from the OP's question)
According to Wiki... https://en.wikipedia.org/wiki/Pilot_licensing_and_certification
Aero-Club de France began issuing certificates in 1910, retroactive to 1909. Bleriot, Wright Bros are some notables. https://en.wikipedia.org/wiki/List_of_pilots_awarded_an_Aviator%27s_Certificate_by_the_A%C3%A9ro-Club_de_France_in_1909
Royal Aero Club (UK) also 1910. https://en.wikipedia.org/wiki/Royal_Aero_Club
Aero Club of America began issuing licenses in 1911. Glenn Curtiss and the Wright Bros, among others. https://en.wikipedia.org/wiki/Aero_Club_of_America
It seems these were mostly ceremonial, rather than required.