Could You elaborate on that? My sources say: Extra Dark Sea Gray, Dark Slate Gray (plus Light Slate Gray on upper surfaces of lower wings, but these aren't visible here anyway) and on the lower surfaces either sky or light blue.
And here's the rest of the stuff related to Polish Wings in France.
Potez 63 was a family of French twin-engined combat aircraft designed in mid 1930s and entering service since 1938.
Potez 630 was a heavy fighter, delivered from May 1938 (production run of 86 planes). They were to be used both as day and night fighters, but their engines exhibited performance below expectations and they were relatively quickly removed from most operational units. Also, one or two P.630 fighters were bought by Switzerland.
France (Switzerland), Potez 630
Potez 631 was also a heavy fighter but with somewhat better engines, delivered from August 1938 (production run of 208 planes). They were used mostly by night-fighter units. At least one P.631 was purchased by Yugoslavia.
France (Yugoslavia), Potez 631
Potez 633 was a bomber variant of the family. 71 were built, although mostly for export as French Air Force decided against using two-seat bombers and had only limited number of these in operational training units. 20 were exported to Romania and 11 to Greece (additionaly Romania ordered 20 more, Greece 13 more and China 5, but these were never delivered).
France (Romania), Potez 633
Potez 637 was a reconnaissance version, but it's crew arrangement wasn't considered particularly practical and eventually just 61 were built.
France, Potez 637
Potez 6311 (63.11) reconnaissance (army co-operation) plane was the most numerous member of the family with 776 produced. Numerous P.63.11's were captured by Luftwaffe and used in training units. Few were used in similar capacity in Regia Aeronautica. Romania bought from Vichy (or German) authorities 67 planes and Hungary 40 and both these countries used them as advanced and operational trainers.