I know a watch can sit at an AD for a bit, but being stamped late 2012 I was still unsure. Especially since not only was the watch mint (thank you Fred), but the AD has only carried the brand for 2 years.
I had sent a pic of the warranty card to the gal at Bremont, but she had already answered all the questions I was expecting. On their own accord this lady researched my watch and I received this email this morning:
I have looked into the history of your timepiece and can confirm that it was built in 2012 and sent to Fox’s Gem shop, Bremont Authorised Retailer.
When the Supermarine movements are assembled, they are all fitted with the white day/date and are replaced with the black accordingly. I can only assume that this this is a very rare occurrence and your date disc was not replaced. Your timepiece with the white day/date disc is very rare and will be sought after by watch collectors. However, if you would like to have the day/date replaced with the black, I would be happy to arrange this for you at no charge.
Aside from the fact that I have become a recent Bremont fanboy since receiving my watch I am equally impressed with their service. I don't plan to update to a black wheel as I never cared either way. I just wanted to know the history of why it was white.
to Bremont and I must re-thank Fred once again for a excellent transaction. 
... and right back at ya for a great transaction.
