This is a great old hood ornament but I am not sure which car it may have came off of. It is enamel panel with colors including cobalt blue, red and white.
There is a knight at the top with a helmet on. It is in great vintage condition and only missing a small bit of enamel. It is signed on the back REX 5TH AVENUE.
It measures 3 3/4" tall - 2 1/4" wide - 1/2" deep. Please let me know if you know which car it belongs to.