Vintage brass telescope lens magnifying glass scope lens

Description

It's hard to get good pics due to flash reflection on glass lens!  This old brass piece measures 2 3/8" in diameter, the actual lens is 2" in diameter.  It is approximately 5/8" wide.  There are grid marks across the face of the lens, not sure if this was used in some kind of spotting scope or telescope... it works great as a magnifying glass!  Some small superficial scratches on lens consistent with it's age.  Unique!