The photo above illustrates civilian Sunbeams on war duty. The picture is dated 1914, with the caption: ‘Soldier cyclist on Silent Sunbeams’.
Compare those machines with ‘The Military Sunbeam’ below.
1915 All-Black Golden Sunbeam for Gentlemen
3 Speed Gear with BSA Hub
Sunbeam Back pedal Brake
1915 SUNBEAM CATALOGUE EXTRACTS