The case is sterling silver (925) assayed in Glasgow (sideways Fs) in 1908 (letter L).
So maybe made by Webbs in Birmingham and sent for assay in Glasgow by the retailer of the watch who got the case made cheaper in Birmingham than they could in Glasgow (Aye, those canny Scots, dinna waste a penny ye ken).
I'll check the movement after I've had a coffee. Any dial pictures?
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