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Well actually, my Enschede specimen is the 1908, and it shows no attribution for that font... but looking at the rest of the table I thought maybe by 1978 (the date of your specimen) they could safely conclude it was Sabon - the "petit romain grec" attributed to Sabon was sold in the same year to the same customer. BTW, the 1908 shows no other font at all with a "gamma-upsilon-nu" ligature (unless I missed it).
So I kinda guessed. What's my punishment?