Lighting it up

A friend on mine spotted this set.
If you squint a bit you can see a marker, perhaps burnt on to the glass (it’s too high up to see properly), inside this street lamp. It bears the arms of the old Shrewsbury & Atcham Borough Council. There's a painted white F there too. I suppose it’s there as a mark of ownership.
Was it a way to deter thieves perhaps?

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