This prototype XB-26H Marauder (serial number 44-68221) nicknamed "Middle River Stump Jumper" was a converted B-26G Marauder to test a four wheel bicycle undercarriage landing gear. Printed caption on reverse: 'A-30437 USAF - Martin XB-26H (3/4 front view). U.S. Air Force Photo.' On reverse: U.S. Air Force Photo 1361st Photographic Squadron AAVS (MAC) [Stamp]. [See "B-26 Marauder in Action - Squadron/Signal Publication No.50" Page 49.]