Unknown Manufacturer 142551 / 100 600mm f.l. Dbl Convex Singlet, Mounted

This is a double-convex singlet of 75mm diameter and 600mm focal length. It has been cemented into a pin carrier using epoxy and would be quite difficult to remove without destroying the cell. The manufacturer is unknown, however there were some markings on the side of the optic. They include:

JML DBL Convex 142551 / 100.
600mm / 75 diameter

The lens does have a MgFl coating that appears to be for use in the visible region. Surface of the lens is in excellent condition (near-perfect).

Photo set 1777