"S-4":
S-4, was part of the "S-2" class of Schnellboote consisting of the boats S-2 to S-5.
The S-2 class boats were externally very similar to the preceding S-1 boat, but were 1,15m longer and heavier.
S-4 was commissioned on 11th June 1932 and served alongside her sisters in the 1. Schnellbootshalbflottille.
All of the S-2 class boats were sold to Spain in 1936.
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