[projectfolly]

"Bolt On" Remanufactured Delco alternator for externally regulated applications.
Old stock left over from auto repair facility that closed down long ago. By the looks of it, rebuilt/remanufactured in the 80s.
The part number is faint on the housing but it appears to read 1100687.
Also appears to have 55 stamped on it, assuming that means 55 amp.
Date code looks like "D69" or "069". Cant tell which.
According to the box, the applications are for GM '63-72.

Not sure if the part number is exactly for a Pontiac application, but would be functionally correct and correct looking apart from the blue pulley and fan.
May have to re-clock for your application.

$35.00 + shipping.