If you are referring to the black spot on the reverse, that is not zinc rot. And looks like its a slight MAD and the reverse letters are showing signs of a partial grease-filled die.
with the above. The black looks like stains. Zinc rot looks more white or grayish and cruddy. You could help yourself a lot if you started cropping your pictures right to the coin. That makes more detail visible. You can use the image optimizer to crop. Here's an advanced stage of zinc rot for your reference.
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