There seems to be some confusion here. U-505 was a Type IX C. She was the boat captured by Daniel Gallery's task force and is on display in Chicago. This model is of a Type VII C, the most numerous class of submarine ever built. The two are very different, although they share some traits. There are many exceptional boats that could fit this model, including U-47 (Prien) and U-99 (Kretschner), depending on the sail. The after edge of the sail on U-47 leaned forward, the U-99 aft.
Bill Morrison