Butter wasn't always standardized - that started in 1907, and as you can imagine, it wasn't universal for a bit of time (though how much, I don't know). Additio

Butter wasn't always standardized - that started in 1907, and as you can imagine, it wasn't universal for a bit of time (though how much, I don't know). Additionally, you can substitute a cup of some tub "butters" for the real butter called for in a recipe. https://en.wikipedia.org/wiki/Butter#:~:text=United%20States,-In%20the%20United&text=It%20is%20usually%20produced%20in,this%20manner%20for%20mass%20distribution https://en.wikipedia.org/wiki/Butter#:~:text=United%20States....