This seems to be a flag of a unit which was disbanded in the later 1690s. The heraldry is entirely British.
Being a uniform and flag design service to wargamers and to the imaginary crowned heads of 17th and 18th Century Europe, especially of the Seven Years War period - now By Appointment to the Court of Saxe-Bearstein! (But please note that the uniforms and flags presented here are not fictional - they are genuine 17th and 18th Century uniforms and flags that are as authentic as I can make them from my sources.)
Flag List Pages
Saturday, 9 March 2024
Flags of Savoy 1693-1704: Battalion Flag of a British-Paid Protestant Regiment from the Triomphes Louis XIV 1690s
Tuesday, 5 March 2024
Flags of Denmark in the War of the Spanish Succession: Prince George's Regiment of Foot Battalion Flag
3 battalions strong; each of 6 musketeer companies. There was one grenadier company.
One battalion of Prince George served in Ireland in 1690. One battalion served in Imperial service 1702-1709 and was in theory 6 companies and a total of 691 men strong. The first and second battalions of Prince George were in the service of Holland and Great Britain in 1701-1714; there were 13 companies (including the grenadier company) with a theoretical strength of 1544 men.
And this was the battalion flag according to Sapherson, The Danish Army 1699-1715:
And this was the uniform in the early part of the WSS: