"Univis" fused bifocals
"Univis" fused bifocals, no. 32
"Univis" fused bifocals, nos. 31-36. Note:- no.31.= 17 pieces on mounted board; no.32.= 14 pieces on mounted board
"Univis" fused bifocals, no. 32
"Univis" fused bifocals, nos. 31
"Univis" fused bifocals, nos. 33-36