The top one is the German copy of the French Caquot M2 observation balloon that can be seen in the bottom image. German copy was named AE. Ballon/ AB. Ballon or just the Type Ae 800. These balloons were made by the Riedinger Ballonfabrik in Augsburg. The volume of the French balloon was of 900 m³ while the German one was of 850 m³. The shell length was 25 m, the maximum diameter- 8,15 m. So the model of 1/48 scale would be about 520mm ( 52cm) long what is about 20.47"