Managed to get hold of a "rounded corner" 1916 Gaunt badge (Thanks Rick).
Does it resolve the 'made' or 'modified' issue ?
In hand , it looks and feels like it has not been modified and hopefully the photos show this.
Weight : 10.00g (but bottom fitting is missing , so initially a bit more).
Corners appear symmetric , similar shape , angle and size.
No signs of 'clipping' or filing on corners.
No damage/distortion from being held in vice.
The top corner is smooth and well shaped , unlike others that appear more 'pointed' or 'flatter' due to difficulty in shaping caused by pin fitting getting in the way.
One area of doubt is that it has a 5 figure (early) number
94618 , so if Gaunt manufactured this style why go back to the 'pointed' version ?
So, although I now have both Gaunt and Wylie versions there is no definitive proof that they were 'manufactured' this way and they may 'possibly' just be the result of 'modification' by a skillful jeweller/metal worker !
.