In a message I sent to Xavier:
For a long time I have had the idea of having a drop down menu for mint marks/mints in the year list. Although some mints have marks (French "wing" mark, German A D F G J, etc.), other mints have no marks (Royal Mint, etc). Because we can't include non-marked mints in the field, I have included the mint in the comments field instead. By any chance could you implement a mint drop down list that would include both mark and non-mark mints?
A drop-down menu for mints should be implemented to include mints that do not have mintmarks.