[dragon166]

Hi Graham
If this was a RN badge it would definately be pre 1920/21, when the central jewel changed to blue instead of red. With RAF badges I don't believe there was such a strict demarkation. However, the various wings I have in my collection show the red central jewel on the 1920s/30s Full dress wings for both temporate and tropical use. All the examples of later versions I have (both 1947 patterns and later) show a blue central jewel. The straighter wing pattern would also suggest to me that your wing is 1920s/30s pre War pattern. Then again it could just be a tailors error!
The wing on the Full Dress uniform shown on Hylton Routledge's site is similar to yours.
Dave