Quickish History....

With the information that has been shared and acquired it seem that Gray stated in the stationary engine game about 1909 by converting their marine engines over for stationary work. The horizontal hit miss style engines start in 1911. These were Gray Junior engines. Speculation is Termatt & Monahan was contracted to build these Gray engines. They started with two sizes 1 1/2 HP and 4 HP, Later that year they added in the 6hp and I speculate they were built by the Burkett Company . These first engines were painted Green with Red Skids and Battery box per the information in the catalog. 

Late 1911 into 1912 the 2 1/2 hp was added to the Junior line along with a change in color to all Red. Some were still shipped Green usually sporting a tag instead of a embossed hopper probably to keep up with demand.

By Mid to late 1912 they added the 1 3/4 hp model JN built by Nelson brothers and demoted the 1 1/2 hp Model J  to 1 1/4 hp. At the same time the nick names started as you can see on the serial number list and the brochures on the site. 

1913 added the model G engines " Thoroughbred Line " in 2.5 hp & 4 hp with a new governor design. These engines didn't keep the new governor design long due to issues I speculate. 1914 came the new governor "G-2" design with the speed screw. Along with the new design the 1 3/4 was added to the Thoroughbred line. 

1915 Gray was introducing a new style enclosed engine the Model H 777 along with this the Junior line was getting fazed out with T&M changing their own designs. 

1916 the nicknames get taken away somewhat and things change to the Super Power & Power King Lines. The Super Power engines were still the G-2 engines just bumped up 1 hp rating and the Power King engines were left over 1 1/4 hp model J engines and the rest 2.5 hp, 4 hp, 6 hp, 9 hp built by Westchester engine company in Pennsylvania.  

1917ish the Power King engines did change contractors to Nelson Brothers, I believe due to Westchester selling to Schramm that year and Gray moving into their new factory on Mack Ave. 

With Nelson Brothers contracted for the Power King Engine line, they now offered hit miss & throttler engines. The Paint color was then changed to Battle Ship Gray on the Nelson built engines according to sales brochures. This doesn't seem to be consistent though with original paint engines submitted.

Gray decided to give up the horizontal hit miss style engines about July 1920 and at this time Gray Motor Company split into Gray Marine Company & Gray Motor Corporation. Gray Motor Corp. made truck, tractor, and car engines, and built their own car for a time, up to about 1926. Gray Marine built marine engines till about 1967.

Email : grayhitmiss@gmail.com