Based on this, it could be even older.
Eleven Massachusetts Rainbow members and adults were invested with the Grand Cross of Color through 1937, but no additional designates were named until 1957. At that time, a class of 247 Rainbow Girls, Master Masons, and Eastern Stars became Masters of the Grand Cross of Color at the Ceremony held at the Hotel Bradford in Boston. Each year since then, Grand Cross of Color designates have received the Degree at the time of Grand Assembly.