I know according to the guide(i don't currently have one)this is probably a "somewhat" common piece.......but it's only the 2nd i've ever seen,.....and the 1st ive owned. This is a Hemingray DOUBLE PETTICOAT embossed 145, with the wire groove closer to the base rather than the top.....and also a "darth vader" appearance. I don't recall the 1st of these i saw years ago having the "darth vader"appearance. I have four "darth vaders" now, a Brookfield, a Postal, a oddball Cal, and now a Hemi