This is a vintage Jaguar car keychain featuring a British racing green round emblem with a gold-tone leaping jaguar logo.   A circular green enamel pendant featuring the iconic gold embossed "Leaper" logo and the text "JAGUAR" underneath. It's fitted with a stainless  twisted wire cable/rope loop fastener rather than a traditional split ring.
 
This was a promotional accessory given by dealerships or sold as official merchandise during the 198-s and 1990s.
 
1" diameter emblems x .5"d x 2.5"l with loop
Back engraved "Jaguar of Thousand Oaks [California] 805-371-4300