It varies with me depending on what the quilt is for. If the quilt is for a certain person or certain occasion then I would add that information to the label.
Such as:
Made by (name)
For (name)
Occasion
Date
If the quilt is not specific or unknown at the time, I just put my name and date on the label.
I am sure there are "rules", but we can make our own rules
I don't like a label to be big or wordy just the facts