Makers Mark and Date Clarification on Birmingham Vinaigrette

[bennythewolf]

http://www.flickr.com/photos/84961964@N00/270348540/
http://www.flickr.com/photos/84961964@N00/270366969/
Hello. This is my first post here and I'm after some clarification on this Vinaigrette. The date letter 'V' or 'v', which I have't been able to photograph very clearly, puts it at 1793 or 1819 The maker's mark is IB so I would say it was John Bettridge, however, the cartouche has straight edges, as opposed to the rounded one shown in Jackson's. Hopefully somebody can clarify these details for me.
Cheers.

[Granmaa]

Silversmiths often had more than one version of their mark; in fact, all the Bettridge marks I've seen have had straight sides.
I'm not completely sure of his working dates, but I'd say 1819 is more likely.

Miles

[bennythewolf]

Thanks for that.