My mother made guacamole. Its key ingredients were avocadoes, diced onion, sour cream, and worcestshire sauce, (at least it didn't have mayonnaise like her famous cottage cheese dip, which also had worcestshire sauce) but it wasn't really like the guacamole that we make or serve today.
It was fabulous, though, because it was elegant - at least, we thought it was fabulous then. It was smooth. Absolutely mashed to a pulp with a fork and blended with sour cream, almost pistachio green.