Looking at the sponsor marks, I can't find any record for the A.V. mark on the inner case. however, I believe the A.B. mark on the case stem may be the sponsor's mark registered at the assay office by Arthur Baume (1888 - 1923) Managing Director of Baume & Co. of 21 Hatton Garden, London.
I would assume that John Anderson was the watch's owner. Given your resources I expect you could easily track him down. That's the thing with watches, once you start looking at them you never know where the journey will take you.
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