It’s a car mascot. It’s 10” long with swept back wings.

Here is Lot 524 from Sotheby’s November 1998 Sale, also 10” wide, also a car mascot, attributed to Walter Samuel Lewis, CBE, who was a mechanic in the RFC 1912-1918 and later mayor of Birmingham in 1942.

While some had two holes and were solid and were clearly meant to be bolted to the bumper of your Astin Martin, I don’t think they all were meant to be and many could quite possibly have meant to simply have adorned a place on one’s mantlepiece or where ever.
I have a small collection of aviation artifacts called The Aero Conservany which you can visit, if you like, by clicking the link below. Most of its bits and pieces of old German aircraft from 1914-1918, but there are some early RFC and RNAS items. Here is an RFC car mascot, for instance:

And I’m not sure if this is a car mascot, so to speak, showing the AFC or Australian Flying Corps service wings, perhaps from a lorry, or if it’s from a hut or building. I hope to see it in a period photograph some day.
I hope this is informative.