Rule Britannia

I recently purchased a few Silver Britannias.

Each contains one troy ounce (31.1g) of fine silver, and has a face value of £2.

The Royal Mint sells them for £22.50.

There's a long history of currency debasement in this country, and though Sterling silver is well defined (92.5% pure), the weight of the "pound" itself has changed over the years, so the definition of Pound Sterling has shifted. I'll do some calculations when I've got a bit more time.