The submarine is one of four such boats, either K-II, K-V, K-VI, or K-VII, of the 'Dutch' Royal Netherlands Navy, photo reportedly taken in the 1920's in 'Naples'.
It is from the Dutch submarine website under 'Mystery photos'. The abrupt 'skeg' and stern planes are very similar to American subs (the EB designs, not the 'Lake''s) such as the K and L classes. However I mentioned 'abrupt' referring to the stern skeg. Those American boats didn't have stern tubes. Look how close the torpedoes exiting the stern tubes must pass to the propeller blades!
Do not torment here. It is fun learning. Thought you would be interested to know we have been getting a few very nice comments about 'Submarine Aesthetics' from other SC members. Fun to figure these things out, and realize the hundreds of sub classes we have scarcely touched yet. Lets keep this going Antoine! This is fun! Stump Me Please!
Could someone post a quiz picture on their web page for Submarine Aesthetics please we can link to this page? I cannot seem to start my own simple web page and post it there. My earthlink server says one is there, my webpage instructions it is not.
Been busy! The answer to the identity of the submarine stern in the above image is of HMS Explorer (1956), the Walter hydrogen-peroxide experimental submarine and high speed target sub. Image is of her stern upon her completion.