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I really dont know much about microscopes at all, but I have a question. I have a pen-like device I assume is some sort of microscope. It has polish writing on the box. it says,

PZO
WARSZAWA

MIKROSKOP PIOROWY MIP
POLSKIE ZAKLADY OPTYCZNE-WARSZAWA
ul. Grochowska 320
__________________________________________________ _____________

On the pen part it has a top and bottom cover and is black in color. The middle is metallic and says, PZO 16x-32x



Any idea exactly how old this is (it looks pretty old), and if it may be worth anything? Thanks so much.