These ARE early 10SI alternators. Before this and in many cars the 10 DN alternator continued well into the 70's.
These were Very reliable in function. Only real issues were the front case being open style has weak spokes.
The Corvette and Pontiac Firebird were the test bed for the 10si program IIRC. I owned a couple that were on 350 and 400 birds, not trans am. Both sold for 500 each as others have mentioned. The market isn't that big for these.
The auction reminds me of heartbeat city selling 37 amp REGULATORS for 6 cylinder. 1969 camaros as " COPO" original parts. Both used them. But....
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" Long may we DRIVE !"
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