Hello there,
we are currently looking for referees for several ancient issuers. Usually, it takes greater knowledge to work around these, but I would like to emphasize that you do not need to be university professor for that (if you are, we would be delighted to have you though :) ), sometimes, owning a several examples and having one or two specialized catalogues would be more than enough to enhance and maintain these sections. Of course, general referee conditions apply here as well.
If you are there and willing to help, we would be glad to have you on board.
Best regards,
Jarek