Just as reference, after looking at several hundred pieces (
case number project detail if interested), I have seen only 2 of these casebacks. Coincidentally both in the last several months. These are separated by a fair amount in case number (707D424 and 706D623)
It does carry the same inside caseback markings we expect to see on a Mk2 (details
here), though the Mk2 lacks the star on the caseback.
I find it difficult to believe that this was an intended caseback for the Zenith A386 (Mk2). But as one-offs...I guess anything can happen during a run. I'll shoot Zenith a note and see what they have to say.
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