COBI 4852 WWII German Submarine Type VIIB U-Boat U-52 Model Kit. Construct a detailed replica of the famous German U-boat U-52 from World War II using this 474-piece building set. The model is designed at 1:144 scale and features rotating propellers that actually turn. It makes an excellent gift for both young history enthusiasts and adult collectors who appreciate naval history. The pieces are compatible with other construction block brands, allowing you to mix and match with existing sets.