according to the royal mint site 26,180,160
here is the link to the royal mint site
https://www.royalmint.com/corporate/circulating-coin/uk-currency/mintages/one-pound/
been handled too much, dirt, grime and such gets on the coin and has been there for sometime and has eaten into the metal so what you see is the coin rusting as for the red color i'd gather some sort of reaction to something it was exposed to