Series 3 and 4 were Persian orange 2 with cream wheels (rear rims still silver). Persion orange#2 is Dupont Std 112-8300. It would be safe to get the cream from an Allis dealer.
It said these Dupont numbers are for an old formulation and had to be converted by the Dupont dealer.
If you don't know what series you have start by giving us the serial number and someone can look it up. If yours has round muffler and headlight by the grill it is probably a series 1 or 2. If it has oval muffler, headlights on the rear fenders it should be a series 3 or 4.

PPG #60080 - listed as "persian orange" by PPG

PPG #60396 - listed as "persian orange" by PPG

DuPont #655 - listed as "persian orange" by DuPont

DuPont #29047 - listed as "allis chalmers orange" by DuPont

I have personally confirmed that PPG #60080 is the earlier orange...referred to on this board and others as "persian #1". PPG#60396 has significantly more red in it and likely is the "persian #2", so called.

I have not confirmed the DuPont numbers as to which is which but suspect the 655 is the earlier pumpkin shade referred to as persian #1.

The above numbers are currently mixable in DuPont's NASON line and PPG's OMNI line of automotive paints.

Rod