Thanks for the info. I have three copies of the same stamp and as many times as I've looked at them, I've mistaken the overprint for black (not blue), thus the reason why I overlooked it in the catalog.
But a closer study shows it is a very deep, dark blue.
Same thing happened to me when working with Panama stamps. The album and catalog mentioned blue overprints but they looked black to me. Was confused for a while.
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