As you have surmised, it is a converted WW1 period issued collar badge. Badges of this and the WW2 period were often converted into pin-back form for wear by loved ones.
many thanks for that.
Can you show the cut through lug John.
I would go with a sweetheart from these pics.
Whatever its just an opinion.
I have to agree with Jerry. Had it been a converted badge the back would have been stamped and not smooth as is the case.
Hi, For what it may be worth, I would suggest that Stug III is completely correct. I have several thousand RAF/RFC badges and have never seen a collar badge either Officer's or OR's in your style of manufacture. If it was offered to me, I would considder it to ba a sweetheart. However, I stand to be corrected.
Cheers Michael R
many thanks all, I had wondered about the flat back, the hinge for the pin looks to be the same colour as the rest of the badge, while the other end,loop/lug is darker, will get a pic tomorrow,hopefully its a period sweetheart, I rather like it !.