It seems that all the pictures on that City of London slideshow are copywritten(?). None the less the Alton Pub and the Six Bells Pub drawings are available elsewhere without the CW!
So here is the Six Bells entry. First of all the pub sign picture taken by dear Michael Fletcher RIP.
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And you can just make out the pub sign in the drawing.
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Neil: That Ms Cotton lady doing Brentford Research up in Leicester may have an answer to that Alton Pub query.