(SP-727: l. 20'; b. 5'6"; dr. 1'8"; s. 40 mph.)
Seven-a motorboat built in 1917 by D. R. Shackford, Norfolk, Va.-was acquired by the Navy from her builder on 29 June 1917.
Seven was used as a rescue boat for flying students in the Hampton Roads area. The boat was eventually found unsuitable for further use, struck from the Navy list on 2 November 1918, and ordered destroyed.