Kryptok developed  a new form of bifocal lens to great acclaim 120 years ago. The Kryptok len's bifocal side was machine finished at their factory - controlling output and consistancy resulting in a surface more stable and difficult to improve upon.

The wooden mailing box in this listing has both Kryptok and Consolidated Optical Toronto markings with a  two cent canadian stamp, and a second Consolidated Optical Toronto label and two cent stamp on  either side of its sliding top. The box measures 8.5cm x 6.6cm x 2.8cm.

This vintage wooden dovetail mailer box is in good used condition with marking, minor damage to the top's slider groove, tearing/missing piece to the Consolidated Optical label and wear /damage to the two cent stamps.