5779 Pte Henry William Randall(or William Henry) was infact a Territorial in the Welsh Regt and this is why he has two numbers. The second six figure number was issued in Jan 1917, and all Territorials at that time had their regimental numbers changed from four figure to six figure. Sadly I don't have my notes with me or I could have told you which Battalion he was serving with from the six figure number. As it is the both Medal Index Cards and Medal Roll Books are littered with clerical errors, but are still a fantastic source for both researchers and family historians.