I want to add one of these badges to my collection.
In my search ( ebay)for this badge, I have found that there is a 3" and a 2 1/2" versions and I also have found that there is a One piece and a two piece models.

I would like to get an original.If possible, could somebody give me a quick lesson on these badges or point me in the right direction, It would be Greatly Appreciated
Thanks
Semper Fi
Phil