This is a 1907 Golden Gem Adding Machine in good condition in case.  It is the seldom found model 16 with 8 digit columns (most models were the common 7 digit columns).  The first 6 columns have good working 10s carry over.  The last 2 columns do not carry over.  Included is Metal Stylus and not certain if original, but works perfectly with this machine.  In 1907 GEM calculators were made by Automatic Adding Machine Manufacturing of New York.  Serial number is stamped 90170 with patent dates of March 1, 1904, March 27, 1906 and March 19, 1907.  Case is labeled “Golden GEM Adding Machine”.  Calculator has two legs that fold out for inclined use.  The Martin Book states “Machine is also known under name “Gancher Adding Machine……, Designer is Abraham J. Gancher & manufactured by The Automatic Adding Machine Company…..”.   Calculator Size is 4” x 3” x 1”.  Case is 6” x 5.5” x 1.5”.