RAF press photo.  Black & white, approximately 20 x 16cm.  Aerial reconnaisance photo that appears to show various trench systems and the heavily cratered landscape of WW1.  The image is marked '39L B 2874 51 BV19.20.25.26, 18.3.18.12'  March 1918.  Marked to rear 'Royal Air Force, London Photo Centre, Negative No. AA1092'.   A little creased at the edged but generally good.  Stock code P15027.