#1 Big Mac introduced in '68 (same year as hot apple pie), Quarter pounder introduced in 1973, Chicken McNuggets in 1983, couldn't find double quarter pounder info, but my guess is later than 1973.

#2 no idea

#3 Volvo introduced and marketed 3 point seat belts in the 50s, but there was no SAE standard until '61 . in '62 some U.S. manufacturers provide lap belts in front outboard positions (23 States have laws to requires belts in front, most effective 1/64) In '61 all mercs had front seat belts


#4 I'm going to say it was the 600 Pullman or Laundellete and Guess over $20k


#5 no idea

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Jason Priest
1999 E430
1995 E420 - retired
1986 420SEL - retired