In reply to Good ad finds Ken. This is a by neetstuf-4-u
Yes, the white gold versions of this era do not get seen as often as the yellow, or even the rose in some years. Often the ads call out one variant, but speak of other available colors (case/dial) without stating the other variant. I believe the 'XX' is designated to the yellow gold only; and the mention the V54R... is specific to a number used only by the vendor (Spiegel in the case of your linked ad) and not assigned by Bulova. Having only one variant in an ad, but more than one color option, makes it a challenge to determine which color the variant goes with. Sometimes we have other sources to help clarify it, and sometimes not; sometimes the ad description states yellow (like in your linked ad). Also, I haven't gone through the HE ads to see if either BB or ZZ was used with another style/design; perhaps the ads stating white as one of those is a mistake. I did see that there were other black dial HE styles, so it is possible this style had that black dial option. I would think so, as white gold looks best with a dark color dial.