Series Number Id: UNKNOWN. At head of map in red overprint: K.11.-M.23. "Trenches corrected to 27-10-16" in red. "Approximate British Front Line on the morning of 28-10-16" in red. "1st Printing Coy RE 5th Section (374) 26-10-16". German trenches, British front line pecked blue. Cropped regular series sheet. Manuscript on face showing British Line after capture of Beaumont Hamel., Location: Research Collections; Fonds: WW1 Trench Maps: France; Box number: PC14; envelope_number: 391.