VTG Brass Folding Spring Loupe Magnifying Glass, SS Studios, Union, NJ

Description

This magnifier is brass and has a green patina due to age which can be removed.  I did not want to alter its current condition and will leave that up to the buyer.  Comes with leather case marked Germany.  Magnifying lens is in place and works remarkably well.  Spring works well to "pop" open the device when unhooked from the small brass fold over latch on one side.  This item belonged to my German grandfather who lived in NJ (I am 62).
Item is marked "SS Studios, Union, N.J."  I believe this is to advertise the business using the magnifier not the maker of the device which I believe it was made in Germany.
SS Studios in Union NJ still exists
and the company history says it started in 1921.  I was amazed to see at the top left of their company website is an identical loupe magnifying device and matching leather case as I am selling here!    I do not know the age of this device and if anyone has more information it would be most appreciated to better date this vintage item.
Please look closely at all photos for condition, size and other details.  Non smoking household