Jeff Grant (a.k.a. "Anchovy" on thesamba.com) has started offering these cool reproduction aluminum key tags stamped to order with your VIN for just $12.
When VWs were originally delivered the keys came with an identifying tag like this. Our '65 Squareback's keys still had their original tag—lucky for us, as most were discarded by the original owners. Though the tags became increasingly thin and more crudely stamped as the years went on, the '58 tag Jeff modeled his reproduction on was cut in a nicely rounded shape from heavy-gauge aluminum.
It's the perfect key fob for your set of original keys. Go here to order yours.