The magnifier is dedicated to textile applications, but is also successfully used in other industries, including numismatics.
Dwane workmanship in a solid brass frame. Clearly used, but fully functional.
Very good optical quality of the magnifying glass used.
Discussed in the Facebook discussion here
Folded dimensions: 25.5 x 16.5 x 8 mm.
Magnifying glass diameter: ~10 mm.