Walter is a Postcrossing legend with just over 4000 cards sent and almost 4000 received. He lives in Stuttgart and sent me an ad card for Allguaer Buble Bier.  Stuttgart is one of Germany's largest cities at 635 000 residents and 5.3 million in its metropolitan area. It also has one of the highest rates of immigrants in Germany. Stuttgart consistently ranks as one of the best quality of living standards in the world, finishing 21st in 2015. Settlement in the area dates back 9000 years. Porsche, Bosch, Mercedez-Benz, and Daimler also call Stuttgart home.