3rd Marine Amphibious Corps "Mourning" Patch

One Of A Kind WWII US Marine Corps 3rd Marine Amphibious Corps "Mourning" Patch. Someone has taken a standard US fuly embroidered patch and has added the black beadwork and velvet band. On the back are two small pins for wearing. The person we purchased this from bought it out of an estate sale a long time ago, and was told by the people having the estate that the lady who lived there, had been married to a Marine in this unit and he was killed during WWII, and she modified this patch to wear in mourning. We don't have anything to back up this story but it makes complete sense when you see it.