Information from Joe Baugher's web site
Torpedo bomber version of Martin MB-1. MBT - Martin Bomber-Torpedo 5711 delivered Feb 19 1920. First assignment to NAS Anacostia Apr 23, 1920. Transferred to Yorktown, Virginia Sep 28, 1920. Served at MCAS Quantico from Sep 26, 1921 to Dec 28, 1922. On Dec 28, 1922 it suffered a longeron crack that was deemed unrepairable. SOC Feb 3, 1923.
Aeroplane Photo Supply No. 732
Aeroplane Photo Supply No. 486
