I got this in a lot of insulators and thought it to be a NN CREB insulator but was informed that this is probably an American NN insulator identified by the lack of threads in the top of the pinhole. The dome is embossed only with an X and unlike the 111 embossed style, this does have a pronounced lower wg lip. This was discussed on ICON awhile back and I missed it, so I was wondering if anyone had dug up any new information on these and what kind of value would be placed on them. It seems since there are 2 types, the straightskirt and this one with the lower WG lip, there would be some sort of listing for these. Any information and help is very much appreciated.

UPDATED: I took another close look at this and it does indeed have 2 vertical lines up either side of the pinhole indicating a 2 pc hinged mandrel known used on Oakman and American pieces. Identity solved. I think....now to figure out what a real value for these would be. Thanks in advance.