"A publisher of black & white collotypes, and tinted halftone view-cards. They used the trade name Photolux on many cards. Most of their white border cards were contracted out to Curt Teich. These cards are often recognizable by their blocky titles and numbers."
Information from “Publishers,” Metropolitan Postcard Club of New York, Accessed online 02/15/2014; http://www.metropostcard.com/publishersa1.html