Found this...
"Max Gray imported his first brass models from Japan in 1952, and there is a strong possibility that Gray and Levon Kemalyan had some business dealings. In the early 1950's Kemtron was the only model manufacturer doing brass detail castings, so it is believed that Max Gray must have purchased his castings from Kemtron. A major portion of the Kemtron casting business went to Japan for models made there. After Max Gray passed away at the age of 50 in 1966, it is believed that Levon Kemalyan of Kemtron acquired parts of the Max Gray line. Both Gray and Kemalyan utilized KTM (Katsumi Mokeiten Co., Ltd.) as their Japanese builder. KTM models, based in Tokyo and founded in 1948, were considered to be the best Japanese producer of small batch brass models at the time. U.S. Hobbies Inc. also utilized Japanese builder Toby for some of its brass products. The Toby Model Company was a brass manufacturer founded by Mr. Noboru Sawada in Yokohama, Japan."
Here is the Kemtron Big Boy... maybe enlarge it and compare details...
