19th Century Pen and Ink Portrait of a Lady

A stunning pen and ink portrait of a lady, very detailed and very skilfully drawn.
It is dated 1805 ( the same year as The Battle of Trafalgar) and there is a circular cypher over the date. I believe this could be the mark of the professional portrait artist.
I can not identify the sitter or the artist.
The frame is remarkable, the picture is mounted in an oak frame which is very well made. This frame in turn has been mounted in another frame incorporating glass.
I believe the oak frame is the original from 1805, but this did not incorporate glass. About 100 years later I believe they decided that the portrait required protecting so Mr Kerridge was instructed to frame the whole lot so that the old frame actually became a mount to stop the artwork touching the glass. Hence we have the two contrasting frames.
We have Mr Kerridge's sticker on the back and he was a master carpenter and picture framer in the early 1900's.
Fascinating item and as you can see has given me a lot of pleasure trying to research and understand it's idiosyncracies.

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