The rare proof is Matte, so yours is most likely the regular one. CCGB 2 years ago was a bit conservative on the non-proof, £60 BU compared to £40 for proof. Yet Spink way back in 2005 had the proof at £40 also, but even back then, the non-proof was £75. Now it would be at least £100 I'm thinking. Spink 2013 has the proof at £50 and currency at £150