Mystery wings for identification

[dumdum]

Hi folks

Anyone care to identify this set of small brass wings?

I was tempted to say "flying club" and leave it at that but the fact that they have lugs like most cap and collar badges and that they are "hollow backed" (just like most cap and collar badges...) caused me to wonder.

So any bright ideas? Flying club? Obscure defunct airline? Looks like a monogram of "D...B" or "B...D"....

[badgecollector]

Royal Air Force (R.A.F.) Dental Branch Collar Badge

[dumdum]

Great! Really pleased to know what it is at last.

[dumdum]

Approximate period, please?