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This vintage mechanical birdhouse bank from Germany was given to van Ryswyck as a present. “You put the coin on the ledge, crank it, and a bird pops out and grabs it in his beak,” explains Sterk. A simple product, but vastly more rewarding than tossing spare change into a ceramic pig, Sterk says. “It gives you more value. Every day you want to give the bird a coin.”