Yes it is JD and now I see you had the question before without an answer. Thank you for taking the time to try and find out who JD was! Here is the piece, it is a Jewish amulet --- large Hebrew letter "Hey" (it stands for "G-d"), with a crown on top of the letter (known as a "Crown of Torah"). It came with silver mounted stones, Austrian silver coins dating from about 1800, all hanging on a faded blue ribbon.