Tag Heuer Autavia CY2110 - black date window instead of white

[konkret]

Recently I have visited a rather reputable pre-owned watch dealer and made a spontaneous decision to purchase a Tag Heuer Autavia CY2110. On the following day I did some online research and noticed that all other CY2110's have a white date window and mine has black. I phoned the seller but they had no explanation for this ("a factory mistake, maybe"). Do you think the theory regarding "factory mistake" is credible?

What would you do? Should I try to return the watch? I don't mind the black date window but wonder if it might negatively affect the re-sale value of the watch?