Many thanks to SWLing Post contributor, Daniel Amoroso, who shares this QSL card and notes:
Attached is QSL # 1 from Radio Habana Cuba for their shortwave broadcast on 8- 15-2015
This was the day the US Embassy in Cuba was officially re-opened.
Card was received on April 18 , 2016.
Very cool! Thank you for sharing this card and noting that relevant bit of history, Daniel.