I love mascots from this kind of events, so I'm very happy, and also the stamps are beautiful and new to me (picture further below). Also, these games sound very intriguing...
Like holding Olympics for just one country, in which its provinces compete for the title, each with their teams. Maybe reasonable for one country with 255 million people!
Wikipedia has the medal table on the PON XIX, and logically West Java won the most gold medals (217, while poor West Sulawesi was last with just one 1 bronze).
The postcard also refers to Bandung 2017, an upcoming World Stamp Exhibition.