Not entirly sure, but i think it is about 5% of the 40000 proof farthings that were minted...that would make it around 2000 exist ...worth anything between £60 and £90 (Ratio would be 2000:40000, 200:4000, 20:400, 2:40, 1:20 ) Also, i believe that the 2A proof is far rarer than the 2A non-proof