c. 120, also known as the Coinage Abolition Act 1838) is an Act of the Parliament of the United Kingdom which abolished the tin coinage taxation system of the tin mines in Cornwall and Devon, and authorized instead an annual payment to the Duke of Cornwall to compensate for this loss of revenue.

[citation needed] According to their website, on 15 May 2000, the Revived Cornish Stannary Parliament sent an invoice to the Duchy of Cornwall for the sum of £20,067,900,000 claiming recovery of alleged overcharged taxation on tin production by the Duchy of Cornwall.

The claim was based on the higher taxation (or "coinage") rates levied on Cornish tin compared to that mined in Devon.

In order to calculate the bill, historical production figures were derived from a privately-published undergraduate thesis of 1908.

The CSP document claims a racial motive for overcharging Celtic Cornwall.