I can confirm 1817/18 as identified by Les.
The case maker is {WR incuse} is that of William Rowlands, 13 Harper Street, who registered this mark 10/06/1817 at the London assay office. The pendant maker's mark is that of Joseph Field, pendant maker, of 9 St James's Street, Clerkenwell, who registered the mark {J
·F in a rectangular cartouche with cut corners} on 6/06/1807, but by January 1810, he had moved to 7 Red Lion Square, also in Clerkenwell.
The cap maker's mark {RE in a rectangular cameo} is one that is commonly found on cap associated with quality London finished movements, signed by the like of BARWISE, John CROSS, DWERRIHOUSE, FRENCH and PENNINGTON. I believe the mark to be that of Robert Edwards, who appears to have been active from the date of your watch, until at least the middle of the 1820's.
I am not familiar with the signature on the movement. In 1818, that address is identified in an 1818 directory so ...
However, George Demez, is listed in Loomes as being based in London between 1825 & 1828. He is not listed in trade directories of 1822/23, but he is listed at that address, in Pigots 1825 directory under watch and clock makers.
I think the history, of this well finished and cased London watch, is worthy of further research. A good find.
John