A few stamps on this little cover from Naucalpan. On the right, a 1977 stamp commemorating the centenary of the Central Meteorological Observatory. And top left, a 1979 stamp commemorating the centenary of Mexico's entrance into the UPU. The stamp below that from 2021 commemorates the 200th anniversary of the Mexican Navy. And finally the pair of stamps on the left are 2021 popular culture definitives showing a horn comb from the Museo de Arte Popular.