I've been looking at some histories of sororities and in every one of them they have displayed badges of the NPC members at the time of publishing.
The one that the following pictures come from at the time there were 25 members of the NPC and I thought it would be very interesting to show you all these pictures. What really inspired me to do this was that Theta Upsilon (
QU that was up for bidding on ebay a few months ago.
The current NPC that were not a member of NPC in 1932 are
ASA
AST
AEF
DFE
FSS
SDT
SSS
The left are the pledge pins and the right are the badges
(here is a color picture of Theta Upsilon)
Here is a picture of Iota Alpha Pi badge that was admitted into NPC membership in a latter date and went extinct in 1971, I just love this badge
sorry for the quality, I did the best that I could do with black and white pictures. The color pictures I obtained off of ebay, so I take no credit for them.