It's not that simple. An idea of the target together with approximate numbers to each section is as follows: Persons in whose name a coin was struck, including the episcopal issues. - 250 Denominations - 130 Metals used including the various degrees of fineness or debasement - 50 Examples of an attributed designer' handiwork - 190 (This is the one with the largest prospect for expansion) Initial or privy mark including overmarks - 330 Mint locations - 150 Miscellaneous which includes errors, metal sources, minting techniques etc. - 90 This list makes some sections difficult to complete without duplication, and in some case impossible. eg. the 26 new designers used for the Olympic 50ps are on coins with the same basic obverse as are most of the decimal issues. There are a number of mints which only existed for a short time which coincided with historical events. These will also be impossible to complete without duplication.