A watch maker can cut a custom crystal for this for about 20 bucks. The pin is 1 & 3/8ths inch across by 1 inch tall with a nice deep area for the hair to be added.
Great piece for your collection. Type in MOURNING or whatever you are interested in seeing culled for you from the many pages of our fine and vintage jewelry listings. This item will be very well packaged in a cardboard box.
Thank you very much for looking.