Dark Coated Siamese Cats

We know that Siamese cats have cream fur in the center of their body - the torso and upper part of the legs - while the extremities (points - strange word really) are darker. This is what makes the Siamese cat what it is.

Sometimes you see Siamese cats that have dark fur on their torso area. The contrast between the body and extremities is much reduced.

This occurs in older cats because of poor blood circulation. This results in the body being cooler which in turn leads to production of pigmentation in the skin that goes into the hair shafts.

I am guessing too that in cooler climates there might be darker fur in the torso area.