Vintage Per Ardva Ad Astra Raf Sweetheart Pendant & Necklace Read Description !.
Appears to have been Modified not sure if it was a badge or lapel pin etc , but has been attached to a chain as shown in photos for a sweetheart maybe.
The Pendant is marked Silver the chain I cannot see any marks or hallmarks.
A Ruler will guide you to size/scale.
Will post by Royal mail Tracked 48.
(DrawC)