Do you have any reason to think so?. I think he may be a siamese mix
True, he doesnt look like the most common "peasant cat", or whiskas cat. He may have a dosage of Oriental in him. Or Siameses...
Orientals are essentially a twin breed of siameses, without the "masque" and usually(?) with solid color on the body. Masqued orientals are even registered as siameses, and vice versa...
Mixed out Siameses dont have masque either, as the point gene is recessive.
Both are possible among ancestors, although siameses are more common than orientals...
Good luck!