In the middle: egg salad, sliced tomato, ham salad. “Frosted” with whipped cream cheese. From Better Homes and Gardens cook book ca. 1968.
Serving slice with time-appropriate drinks:

In the middle: egg salad, sliced tomato, ham salad. “Frosted” with whipped cream cheese. From Better Homes and Gardens cook book ca. 1968.
Serving slice with time-appropriate drinks:

Looks a lot like the Swedish dish Smörgåstårta (Sandwich Cake), which is not uncommon to be served at parties.
It’s really quite tasty! Also quite convenient for parties since you can buy a few in the deli section of well-stocked supermarkets.