I would call either Alon or Nola and ask them, giving them the serial numbers. FWIW, I don't recall a Mk II version of the Alon 4.
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LOL, I always thought the Mark II version of the Alon IV was the Alon V.
Mike, if I understand you rightly, you have 2 sets of speakers to sell. I believe there were a couple versions of the Alon IIs, however. Look for the serial numbers on the back and call Nola Speakers to find out which verion of the IIs you have. I think there was less fiddling with the IVs, as Carl ended up basically redesigning that speaker into the V (which had MkI, MkII and MkIII versions).
You might post this on the Speaker Asylum at AA. There are a few of us over there that have had Alons for a long time. There are also some old reviews online that might help.
The IVs are still killer speakers, and the IIs quite nice.