I've had a number of gen navitimers over the years, aswell as gen dials for franken projects. I don't think the subdials were ever a true/pure white, they varied between off white with a metallic base to satin silver. I'm mainly referring to Navitimers between the early 2000s to circa 2009.
When I see navitimer reps with true white dials I immediately think "cheap rep".
Apologies if I'm mistaken and the current line of B01 Navitimers have true/pure white sub dials, but I've not seen any either.
Photos just don't capture the true metallic colours of the dials and slide rule