HELP! several years ago I came into ownership of about 14 food photos by Nickolas Muray these are large photos that seem to be mounted on a 1950s style foam type board used by advertising agencies at that time. Most of them are in original cardboard presentation frames and are stamped on the back with Nickolas Muray & Associates with their address in midtown Manhattan. Some also have a stamp from the advertising agency as well.
It seems these would have been presented to clients/magazines as part of the advertising campaign.
Im wondering if these have any real value and how I might go about obtaining that information