SMLE Training Sight - help needed to identify?

[Nigel]

I picked this up today. I was told it is a training sight for the SMLE. It fixes over the Nose Cap. Can anyone shed any light on this? I've never seen one before. It does magnify very slightly.Attachment 97640

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[Strangely Brown]

Never seen one before; however it does look like a front Galilean sight for a Match Rifle.
These were generally shot between 800 and 1200 yards, the circular aiming spot is the tell tale indicator for my thoughts!

[Eddie Parks]

It would need to be paired with a clearing lens on the rear sight surely?

[Strangely Brown]

Not necessary so Eddie, I has a Steyr supine match rifle that was probably in the region of 3x power that didn't require a clearing lens.