The name Royal Aircraft Factory was used from 1912 until 1918 only.
This button is also known to collectors as civilian drivers RAF 1918-c.1950.
I anyone able to supply proof of either name?
These women seem to have metal buttons:
https://www.agefotostock.com/age/en/...d/MEV-10825329
(scroll down to enjoy more pictures)
And we have also got the WRAF to consider:
https://www.rafmuseum.org.uk/researc...1918-1920.aspx