Hole in fender under battery tray

Professor Fate said
All of mine have it- and it's a punched hole, not a rust hole.
Early A:
View attachment 1716201392

Later A:

View attachment 1716201393

You're right! I never noticed this being a drain hole, but I did think it was kind of strange having such a large hole for a speed clip. These are from my 73 Duster. Never noticed the drain hole in the battery tray either. Never too old & always learning stuff.