This is INCORRECT! This list is in Error. There in NO paint called PG3. This is a great dispute amungst the MM Community. I have argued (upon deaf ears) with this color guide since it was published. Eventually it will be corrected, I hope.
1936 MM's were Yellow
1937 (ca.) to 1947 Prairie Gold #1.
1947 to ca. 1955 (letter Series) PG #2.
335, 445, 5-Star thru M5 & Gvi = Power Yellow M602 newer (except Red & Green Tractors) = Energy Yellow (also known as Industrial Yellow)
There are also several shaved of "Red" used thru the years, from "Cherry Red" with a nice Purple tint to an almost Massey-Ferguson Red in mid 1950's to White Corporate "Sumac Red" used in 1960's & newer.
I grew up with 1 owner 1951 ZAS & 1957 335, thy ARE DIFFERENT Shades of paint. the 335 is the more Orange Power Yellow. I have read several References to these paint changes from MM, in my MM Product history Research. Eventually when Publishes it will cover this as well as much more.