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I don't recall seeing a Bar sticker have to check in storage one day. It has a ZZZ vin, has a twin distributer and on rear carpet it read 928sp which I'm not certain if that is a personal initial or was some kind of track car.
A BAR sticker stands for Bureau of Automotive Repair- It's the most valuable sticker on a ROW 928 or any imported car, as it signifies that the car went through the inspection process and is registerable, drivable, and insurable in the state of California.
Here's an example of what a BAR sticker looks like: