I remember those Mars Marsettes candies. We sometimes had those at the house in a dish when company came when I was a little kid.
And I see the traditional pumpkin pie recipe hasn't changed in 63 years!
And the Swift ham ad is a great example of how social class is used to sell a product. If you lived in one of those homes shown in the ad in 1939, you were doing pretty darned good in life. So the message the advert is sending is "If this is good enough for people who have money, you might want to try it too!".
I have seen that used all the time.