1) SN 46927. 12" l. SN on adjustment base, "cad" on top. 2) 12" l. "DIALYTAN 4X/dkl" on left under adjustment base. "SCHNEIDER/OPTIK/KREUZNACH" further back on left side. SIZE: PROVENANCE: Collection of Dr. Geoffrey Sturgess. CONDITION: 1) 75% orig blue that is worn through where mounts were, black paint near lenses is 60%, optics are clear. 2) 98% orig bright blue, optics are excellent. 43475-1068 BWS (2,000-3,000)