There are very few see-through colored threadless insulators as there is - most are a shade of blue or green. This is the only known CD 731, and it's a shade of deep mustard - probably a 95% match to the average 102 Diamond. This piece is also VNM. This piece has been examined by many seasoned veterans of the hobby at the New England shows and is 100% gauranteed authentic and unaltered. As best I know, this piece was dug along a railroad construction site in Rhode Island in the late 90's. It changed hands only once to a collector in Maine, who has recently placed it in my care. His intentions are ultimately to sell the piece.