The relief notches began appearing in mid June of 1970. The original '71 bumper on my previous 08C Pontiac built 71 Judge was manufactured 6/24/70.
It is possible that a quantity of late production 1970 Pontaic A-body's came from the factory with the notches, though rear bumper guards was not an option on '70 models. Several of us have sought out & bought just such dated cores.
NOS rear bumpers... over the years, the NOS "70-72" rear bumpers I've owned, or had in my hands, had the relief notches & were NOT date coded. If one is building anything close to a true showcar, ones wasting their hard earned funds on an NOS rear bumper (esp with todays rediculous asking prices). The solution is a correct date coded nice clean core bumper, then having it properly plated.
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Buzzards gotta eat... same as worms.
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