Sorry Jim, I used this film once and NEVER again! (Unless I'm looking for an old world feel) too poor of reciprocity characteristics for me.
Just process a sheet of it in B&W developer, you will learn if it's E-6, C-41, or B&W and then it may have rebate markings, if it doesn't it's PROBABlY the FOMA100 stuff, it's not EFKE IR as theirs was a wider curve I can tell you that much.
I don't have original HP5 or FP4 but I do have Arista400 which is from the time when it was HP5+ rebranded and that is also similar but the notch is father in...
Sorry I can't be more help. Just shoot it at 100 and develop one sheet in Hc-110 (B) at 5 minutes and see what you see
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