Hello Roy
A very nice button and with that 'Charles Jennens' backmark it is likely to date before 1832 when the company started to use 'Jennens & Co' as a backmark.
The open backed style of button generally went out of fashion (so to speak!) in the period 1820-1830 so I would say your specific button could reasonably be dated to between 1804 and 1825 give or take a few years.
This narrows it down a little for you.
Happy New Year
Roger
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