Many years ago I picked up this item with Lee Enfield HS gauges and other stuff. It has"Sight Lensatic Mk 1 on the top. Looking through it you can see a triangle. There are two holes for securing it to something. Does anyone know what it was used for??

Sight lensatic mk 1 picture by Willswpns - Photobucket

sight picture by Willswpns - Photobucket

sight picture by Willswpns - Photobucket
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