Vintage Mimi di N Clip On Lion Door Knocker Gold Tone Earrings ( collector)

She opened her own jewelry firm in 1960 in New York City and appears to have retired in1995 and no longer designs jewelry. However, there is a namesake firm in New York named, Mimi di N Design. Her original pieces are marked Mimi di N. Some pieces were dated in the '70s and '80s with a more block-style Mimi di N mark.