gvol21, that's a great cover you have there. Well traveled and a lot of nice backstamps to document its journey.
Here is a more contrived round-the-world postcard that went through Europe to South America, and back. Rather than being forwarded (for free) like your example, the one sports a new stamp from each country it visited.

(not my postcard. Found in Ron Leith Auction catalog #48 lot 863).
Here is a similar idea, an "autograph remailing card" that instructs the receiver to sign the card and forward it off to another friend (with a new stamp).


The fun that people had with the post office in the early 1900s.