My first Pentothal advertising postcard, thank you buckacover! Abbot labs, from 1954-1968 sent out postcards with salutations of 'Dear Doctor', advertising their anesthetic from 87 countries. The lab was located in Illinois, USA, but the cards were sent from ww locations, in: English, French, German, Greek, Italian, Spanish, and Swedish languages.
Variations of the front and back of these cards continue to be found, and any new finds are encouraged to be reported on Tom Fortunato's website. Tom has checklists, and other informative material about this interesting medical postal history. A beautiful illustrative book by David Lai, MD is Pentothal Postcards is still available.
According to the master Pentothal list found here, this is card type #135. The lower left is a view shows a classic Incan no mortar masonry wall of Saksaq Waman, the capital of the Incan Empire. It was inhabited from 900-1500s CE, and could be used as a defensive site situated at a high elevation above Cusco with its imposing and terraced walls. But unfortunately, could not withstand Spanish forces. This site was UNESCO designated in 1983.