That certainly makes sense from what I saw out there, all the later bright brass enclosed case Tann’s did indeed have paint on one or two of the cap screws (usually red), but I only saw them as the 10 lever plunger lock on the higher grade safes.
Going from memory though, the open cased earlier version of it, mostly seen on large Grade 1A post office counter safes and some standard issue Bankers, did sometimes have grey hammered paint on the case like a Kromer.
