Dictionary.net

• He did it, a word inscribed on a work of art after the name of the artist.

1914 - Nuttall's Standard dictionary of the English language
By Nuttall, P.Austin.

• 3rd pers. (So-&-so) made this picture &c. (used with artist\'s signature). [Latin]

1919 - The concise Oxford dictionary of current English
By Sir Augustus Henry