These may possibly be Armed Forces issue as the note in the case advises that they are suitable for wearing with a respirator. The frames and arms are silver or chrome plated. Width across arms is 4 1/4". Very good condition....circa 1940 in original case.
At Molloy's MEGA ANTIQUES CENTRE, Takapuna, Auckland, New Zealand
Specialists in Pacific Islands Items, Victoriana, And a Fascinating Range of General Collectibles