The NR hubs will have a date stamp on the locknuts. Although it's not a definitive date, it can give you an "earliest build date". If it's 85 (or later) the date stamp is on the outside (11=1985), sometime in the 80's the stamp moved to the outside from the inside of the locknut, so a little disassembly will be required on earlier hubs.
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Last edited by Ex Pres; 04-06-09 at 06:33 AM.