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Humana's second hand stores are located all around Berlin. One of them, however, located on Eberswalderstraße in Prenzlauer Berg is extra special. Called 'Humana Vintage' this Humana store is where they have 'authentic fashions from the 50's to the 90's'. Obviously this is where the better 'retro' stuff from the other stores gets sent and if you are a serious second hand and vintage shopper, this is a great place to visit during the week (we assume your weekends are taken up with trauling fleamarkets!)
This cool little store is packed to the rafters with vintage treasures. A bit more pricey than the average Humana shop but they do have a regular happy hour from 11-12 every day where everything is 20% off. Good times! So go get hunting.