I got this a while ago but only just got around to photographing it, so I'm counting it as a new acquisition for the month
It's a WWII-era propaganda poster/calendar that was printed in Mexico, and in this particular case was used to advertise for an alcohol importing company based in Dallas.
It is also huge (one-sheet sized), bigger than most other Mexican calendars I've seen.
The image is titled "Invasion", and shows a British knight slaying a German knight (festooned with Nazi symbols) while an air battle rages overhead.
It was in the frame when I bought it, and certainly not something I expected to randomly stumble on at a local antique mall as I did.