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This button is of the period 1765 to 1922.

The regiment started life in 1685 as the 4th Regiment of Horse.
In 1741 it was converted into a dragoon guards regiment as the 3rd Regiment of Dragoon Guards. In 1765 the regiment was named after the Prince of Wales, later to become the Prince Regent and George IV.

Motto: 'Ich Dien' ( 'I Serve')

Nickname: Old Canaries (after the yellow facings on its uniform, worn from 1816 to 1971)

The lock cover has the crown and VR cypher of queen Victoria.
Unfortunately this padlock was brought to the surface by a tractor and the exposure to air has rusted it completely, but it has a certain appeal to lovers of rustic art !

I have placed this as a class 7b of Henry III London mint.
It could possibly be earlier, either Henry II or King John, it's hard to be certain unless you are an expert.
Found in the Faversham area of Kent, UK

Just over an inch long (27x 7mm)
Gold plated copper alloy.

I am not sure what it is, but it must have been important to have been gold plated.
If I had to guess I would say part of a Roman key ?

It isn't a dress or curtain weight and it's unlikely to be a button unless it was once covered in material.