South Staffs or Queen Mary's Grammar OTC

[dubaiguy]

I recently acquired a KC bronzed brass S Staffs badge on blades. It came with a few OTC badges that I was after and was listed as a Queen Mary's Grammar School OTC badge. Though I am doubtful.

Now there was a thread sometime back showing a Queen Mary's Grammar School OTC badge which was shown as a half Tudor rose on one half and a bound quiver of arrows within a half Staffs knot on the other. The same badge was/is also used as the school prefects badge which perhaps muddies the water a bit.

The bronze badge is a bit smaller that the usual South Staffs strike which hopefully you can see on the attached photo. So what do I have - a bronzed brass small variant OSD, a fake, or a Queen Mary's Grammar School OTC badge?
Mark