Jose Caravaca asks if these photos, taken of Cadiz (circa 1850) by J. Laurent shows a UFO or is merely a photo-flaw of some sort.
The "thing" or "object" is reversed on the photos:
which you can see in these cropped closeups:
Your opinion is solicited, and if you are a photography buff, even more so.
A water spot on the glass negative. Very common.
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