1950's ? Ford rear view mirror - day night FoMoCo ribbed 1946 1950 1955 1960 ?

Description

Offered is a FoMoCo rear view day/night mirror ...particular donor year/model unknown.  Leaning towards late 1940's to mid 1950's. Could be Ford, Mercury or Lincoln...?
Silvering very spotty and cloudy.
Has one quite noticeable ding/dent along the mirror's edge.  (Pic 2)
rear has a some heavy surface rust
2-5/8 x 9 inches
Mirror ball pivots...base mounting ball looks like it should rotate but is lightly seized...have it doused with some penetrating fluid for the time being...will update
All 5 screws are missing...3 base screws and 2 ball tensioning screws.
Will do my best to answer any questions or concerns and thank you for looking...