VALJOUX CAL 15''' MONOPUSHER DATING TO 1914/15

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Hi. I am new to this site and wondered whether anyone could confirm the identity of this wristwatch. The silver case measuring approx. 36mm is hallmarked with London import marks for 1914/15 with GS as the sponsor. I believe it to be the forerunner of the Valjoux cal 22, known as calibre 15'''.
It is in working order although running fast by approx. 5 mins per day. There seems to be a jewel missing from the movement and although working the minutes recorder jumper appears bent. I believe it to be a very early mono-pusher and quite rare. It seems to have the original strap with sterling silver buckle. Many thanks.