(1) EC chip is for sale on this page, set of 5 in fact:
http://www.antiquegamblingchips.com/Recent_Illegals.htm

Engineers Club, Brooklyn NY. I just acquired some of these 1920's USPC Co.-made die-cut inlaid chips made for the Engineers Club of Brooklyn NY. The sample-order book pages of the USPC Co. states for these chips "Re-Ordered 11/19/23." And hand-written in script on the page is also "Engineers Club, Brooklyn." There is no earlier page found, so these chips are from 1923 or earlier. (It is difficult to read the script [dark ink on a dark page] so some have mistakenly read this as "Eugene Club," a mistake easy to make, but on close inspection it is definitely "Engineers Club, Brooklyn NY."). Note, in the picture above, to the left of the bottom of the blue chip [discolored by scan setting] is "Enginee...", and to the right is "...lub. To the left of the red chip is "Broo...," and to the right is "n... N..." New Find. I believe I am the only person who has these chips. See page 29 of Herz' USPC Co. Guide

(2) I have a large set of the chips for sale here:
http://www.antiquegamblingchips.com/sets.htm