A Georgian Royal Edinburgh Volunteers Officers Frock Coat Button

A very rare officers gilt open backed frock coat button of 1st Regiment of the Royal Edinburgh Volunteers circa 1800.
The obverse displaying a central shield within which is depicted Edinburgh castle. Above the shield is a fouled anchor straddled either side by 1st Reg. and round the outer edge is Royal Edinburgh Volunteers. In good condition with minor wear to high points and retaining 95% of its original fire gilt.