Very common in the dot style, in the exact same pattern as yours. As they moved into segment display you see it very little, mainly on the transitional ones with a colon LED of about 2/3s the size die as the charecters. Once they got to the 1/2 size die for the colon you rarely see it. Based on my inspection of 10-15 of each type just now. I remember the first time I got one that was all green chips, " oh joy, a green display". Hardly.
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