BulovaMen's Automatic Leather Watch, 21 Jewels, Hack Feature, Luminous Hands/Markers, Open Aperture, 45mm

What is the difference between 97a109-DD and the 97a109?

Can this be a Quartz watch? It's a 21-jewel automatic, isn't it?

A case thickness of 45 mm - really? I assume the Product Specifications has the case diameter and the case thickness reversed?

Is is possible to get a black leather band instead of the brown?