This card is written on the reverse 'Marcus at boarding school, Officers Training Corps, Market Bosworth' I believe this could be 'Marcus John Stanley Dyson' who served as 2nd Lieutenant with the 5th and 6th battalions and then went on to serve with the 21 London regiment, his brother fell on the 1st day of the Somme, but i am not 100% certain, any help would be appreciated, please get in touch Pic 407
andy@ww1leicestertigers.com