Almost for sure a copy negative.
The notches at the top right are a code identifying what sort of sheet film it is. (From what I see, "commercial ortho" )
While I'm not as familiar with sheet film as I am with movie film, the figures after Kodak look like a circle followed by a triangle. That should be a datecode for 1923, 1943 or 1963 As they recycled codes every 20 years.
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