Hi
Welcome to the Forum!
Flat buttons of that pattern were the standard Royal Artillery button from c. 1785 - 1802. It's impossible to give a precise date. Officers buttons were gilt, O/R's buttons were brass.
Convex buttons of the same pattern were worn by Honourable East India Company Artillery units at a later date, probably until c. 1840's/1850's.
The RA introduced a new pattern button c. 1802 but the old buttons would probably have been phased out over a period of time.
David
Last edited by davidwyke; 17-09-16 at 05:22 PM.
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