Posted 5 years ago
Sold by Neva-Clog, the Duplex Stapler was manufactured in Germany. It was available in the U.S. from 1928 to about 1936. While it didn't do well over here it was popular enough in Europe for the design to be licensed to a number of different companies. There were two slightly different designs for this stapler, the one pictured being the older first version.
A more in-depth write-up about the Duplex Stapler can be found at https://americanstationer.wordpress.com/2015/05/26/neva-clog-duplex-stapler/ .