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I vote for a cut down perferated stamp, the 1965 dated cancel is a bit lat for imperfs.
That guideline doesn't apply to R102a. R102 wasn't delivered until July 1864, so 1864 is the earliest date one can encounter. If you look through SAN, Siegel, and the PF, you'll find that 1865 dated cancels are quite common on genuine R102a.
In this case it's all about the paper. As Bart mentions, The imperfs are on a much thinner paper.
I saw this particular listing yesterday. Overall the margins are smaller than I would ideally like, it appears to have a severe thin, and without being able to check the paper attributes, it's a no-go.