If they don't say Dura Ace, but they still have oiler holes, they might be Shimano 600 hubs. I know at least the 1977 Shimano 600 hubs (low flange and high flange) had them. I happen to have both 1st-generation HF dura ace and HF shimano-600 w/oiler holes hubs in my garage right now and could send you pictures if you need confirmation.
- Don Gillies
San Diego, CA, USA