On the right of the photo is the jamb, on the left is the face of the door.

Mystery Hardware

Thanks to Ken Burkimsher of Stanley Security Solutions for the photo!

UPDATE:  Thank you to everyone who left comments…it is a door viewer in an old church door.  It’s called a “pulpit viewer” and it allowed the pastor to look out at the pulpit without being seen.  This one is at the Westminster Chapel in Toronto.  Pretty cool!

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