These Coast Defense ships measure 9.5″ x 3″. They are model #201. The C-5 first appears in the 1941 catalog as a Shooting Battleship. In the 1942-43 catalog the ship remains unchanged and is still #201 but is now called a Shooting Mosquito Boat. This change is odd because in the same catalog there is the #671 Battle Fleet which has a C-5 Mosquito Boat that is the same size but a very different design. In the second picture you will notice the variations between two different C-5 ships. I do not know if these were different production runs or variations for different sets. The ship in the background with the lower profile is the more common of the two variations.
From my private collection.