If you just want an original paint code for the color the Ditzler paint chip page is posted in the 65 Library page under - Paint Codes, 1965-6 Interior & Exterior - Information and reprints of period paint codes
What paint brand?
Most go with what the painter is comfortable with and has had good experience with as well as what is legal and available in your area. May are concerned about how the exterior paint brand will work with the foundation coats - primers, sealers .....