It has to be something unarguably iconic, I can think of only one, the Casio F-91W

Thats what I was thinking.

Found this here: https://www.vintagewatchstraps.com/sponsorsmarks.php

GAS: George Arnold Stoll for Elite Bracelet Manufacturing Co.

G.A.S: George Arnold Stoll, Chester Assay Office 9 carat gold hallmarks for 1931/1932.

The sponsor's mark G.A.S incuse with no surrounding shield was first entered at the Chester Assay Office in 1928 by George Arnold Stoll, Managing Director of the Elite Bracelet Manufacturing Co. of 37, Portland Road, Edgbaston, Birmingham, later moved to Regent Works, Regent Street, Birmingham (date not recorded). The company also had an office in Union Bank Building, 1 Hatton Garden, London...

I went to see my jeweller friend and he said his 'watch guy' was away till February and in his opinion it may not be worth servicing it as there are no guarantees and it might stop working again a month later!

Anyway i said I wanted to see it running and will go back next month and talk to the 'watch guy' and see what he thinks. The cost to service it is from £75, so I still think its worth it.

The case back is marked with the case/bracelet maker which is Stokase - British Made - GAS which I am told is part of the 'Elite Bracelet Manufacturing Company'.

Thanks for all your comments

Porthole said "That might be an AS 603" . Pothole this is exciting, I googled AS 603 and found a link to a thread on another watch forum where pioneer watch movements were being discussed and found a picture of an AS 603 movement which, to my eyes, look identical to my dads watch apart from different writing on it, thanks for the info, you must have a great memory for movements.

That is the question isnt it John? I feel like I would like to see it running and even wear it occasionally but its so small at 28mm wide 30.3 incl the crown and a whopping 34.4 lug to lug!!

Now Im not a fan of big watches, only having a 6 3/4" wrist but its small even for me, so I doubt I would wear it all that much.

I know a local jeweller who has a great watch guy work for him, so I plan to go and see him and get a guesstimate on a service/ repair job and take it from there.

Thanks Porthole. Not sure where he bought it but I believe it was on his wrist through WW2, he served in the Royal Artillery.