That's an awesome find!!!!
ha, that's funny, I was just about to let you know it was McKinnon and not McMillon
here is mine, with a 1915 date, so one year older than yours.
what are the specs on yours? blade width, head length, handle length, weight?
Mine is stamped 3^3 and does weigh 3lbs 12oz - total weight is 4lbs 8oz. edge is 5 1/4", head is 7 5/8" long, and the handle is 29" with the clipped fawns foot. Probably was originally a 30" handle, but I rehung the head and had to seat it a little lower, and then took off the point of the fawns foot because it was all smashed.