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Ken, I loaded the 1986-04-05 ephemeris for 1P/Halley into Starry Night Pro+ and it gives a different location to what Sky Safari will predict using the current ephemeris it has. The positions differ by about 0°37'.
If you can scan the photo you could do a full plate solve to get an exact location for the comet, from which you can work backwards to find the time.
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