I am sure there are nuances with the film material itself, as with the watermark on the back of many photo papers, that could give an approximate date that the film itself was produced. I vaguely recall trying to research it when the ones I was looking at first started popping up, getting very confused by the scant information I was finding, and then just buying a couple to see for myself what they were. Once I was satisfied that they were original and not later copy negatives, I wound up buying quite a few more (probably 200+). Of course, with the number of negatives now flowing forth from the liquidation, that's just a drop in the bucket of what's out there.
If nobody else jumps in with real knowledge of the subject, I'll see if I can find (or recreate) the research I did at the time. And either way, I will try to scan some of the negatives I have after tomorrow night's eBay listings are up and running.
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