The most popular cord tip these days is the self pierecing spade lug. While looking for something in a WE catalog in the TCI Library,
Details for 1935 WE Catalog No 9 - Telephone Apparatus and Cable - T1152 Ocr (http://www.telephonecollectors.info/index.php/browse/document-repository/catalogs-manuals/western-electric/we-catalogs/doc_details/12257-1935-we-catalog-no-9-telephone-apparatus-and-cable-t1152-ocr)
I came upon this listing of all cord tips used by WE and where they were used. I found this interesting so thought I would grab a copy of the 3 catalog pages and past them here for posterity.
Click the image to enlarge it.