You shouldn't date Primato hubs, they're lousy company.
Seriously, if you have track nuts that fit, that's all you care about. Like you, I long ago switched 14mm front nuts to 15mm so I could use the same wrench on either. Threads aren't an issue, (if they fit at all) because there aren't other similar but wrong threads to worry about.
Enjoy your hubs which could have been built anytime in the last 20 years or so.
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