Sorry, my bad. I was looking at my SS427 information and had the wrong photo labled to the wrong car. Both very sweet cars regardless.
That window sticker would be very interesting if it is fact real as that has been an ongoing debate for many years and it would nice to be able to prove that you could in fact get the hideaways on the Impala. Just like the claim that you could not get a 335 hp 427 in a 69 and disc brakes were mandatory on the SS427. In 1981 I bought the engine out of a junk yard 69 SS427 Impala and retrieved the POP out of the glove box. It was a very plain and unmolested green/green car with all the SS emblems BUT with a 335 hp engine and power drum brakes. Again, this was in 1981. The car had been there quite some time as well.