I am new to the forum and am starting to learn about Ball watches as I research for a purchase.
In looking at photos of the Engineer Hydrocarbon Mad Cow in Black, I noticed 2 different versions, one with a flat back dial an another with a sunburst guilloche treatment.
Does anyone know the history of the two versions. Is one older / newer or were the different versions available at the same time? Or is it that the guilloche doesn't come across clearly in some photos?