Unfortunately, I couldn't find out the date they were manufactured. I have the purchased date (after the availability of hyperglides), but they could be old stocks.
I've checked the mold numbers on the housings, and I guess this would be a way to find out whether they are hyperglides. But I haven't find any information correlating mold number with date/type of retool. By searching for pictures of vintage blacks, it looks like the molds are numbered chronologically (larger the number, newer the mold), but I don't have an early hyperglide (or late retool) mold number to compare mine with.
Either way, I was just curious, no worries. They are the first blacks that I've used, so a little bit more info on them would be nice for the purpose of comparing to other switches. Overall, I like the 'smoothness' but there is an annoying and inconsistent spring noise on some switches that lube would probably solve (when I find time to do it). If not, a spring swap will do the job if I decide to stick to them.
I prefer tactile switches anyway, but there wasn't any good tactile options for the ergodox-ez, since it is a prebuilt. Blacks were the best quality switches on their list, so that's why I've chosen it. The nice thing is that the kb is hotswap, so I will wear out the blacks a bit until I find time to lube and probably film them, use it for a while, and them go back to tactiles.
Thanks!!
