It’s not a 1916 all GM issue but it is in my firm belief a genuine period badge.
See this thread
https://www.britishbadgeforum.com/fo...ght=Shropshire
Note the badge on eBay also has both scars where loops were originally fitted (E-W) and a nice tapering slider.
I’ve increased the brightness from the eBay listing as it was very dull. It appears to be a very nice GM colour.