A quirky yet useful piece. 
This is an extending magnifying glass which would have possibly been used for map reading. 
Really useful if you need some help to read something or work on something small or for very close crafting, when you just need to see a bit clearer! Alternatively looks great as a decorative piece! 
Measurements: 
Base 15cm diameter 
16.5 cm high
16cm extension on the arm.