In reply to Mat.

Without being able to see the watch and examine it in person, it wouldn't be possible to properly verify the authenticity of the Rolex Tiffany dial in question. On virtually all of the stainless steel ref. 1680 Submariner watches with Tiffany-branded dials, the "Tiffany & Co." name appears in white letters. Additionally, Rolex Tiffany Dials are commonly imitated, so there is the possibility that the dial has been refinished or that the Tiffany branding was added at a later date. However, there does exist a relatively wide degree of variation among genuine Tiffany dials from the era, so the is also the possibility that it is just a very rare and unusual variation, but the watch would need to be thoroughly examined in person to better verify that.