Donegan Optical Company Inc
Classic Series Magnifiers w/Acrylic Lens & ABS handle

3-1/4" 8.1cm Round
Walthers Part # 240-603, p. 856 Walthers 2012 HO Scale Reference
A scale, $10.45, currently in stock at Walthers

 
These lightweight, handheld magnifiers feature ABS plastic handles and acrylic lenses that are produced to high opthalmic standards.