KEYSTONE TYPE SH KOPP 6 1/2
There is one question I wondered about with a uncommon roundel made by CORNING these roundels came in 5 inch and 5 3/8 diameter made by CORNING with the rim legend CORNING CVX 2-2-15 but what was seen from the images the forward of the glasses not the legend side (the back),
was seen as a KOPP RDL manufactured glass.
Until actually getting the roundel in my hands that confirmed the CORNING CVX 5 inch YELLOW glass roundel but something is missing from the usual 2-2-15 to 1935 CVX pattern glass which is a single concentric ring of glass near the rim.
Now that the CORNING is verified being in the guise of a KOPP RDL pattern roundel and knowing of other existing examples had my curiosity piqued of the possibility, would a KOPP made roundel take the form of a CORNING CVX?
This KOPP pattern certainly has the familiar concentric ring of glass found on CORNING CVX's and legend on rim is marked KOPP.
It it surmised KEYSTONE is automotive and emergency lighting manufacturer and doubtful as traffic signal manufacturing part.
While nothing about this YELLOW roundel speaks railroad other than looking like a CORNING CVX pattern, there is no railroad signal glass made with recessed pockets into the back rim for retaining clips .
This image just points out possibly something to look out for collecting KOPP glass masquerading as CORNING CVX.
I do not know within railroad collector circles this being general knowledge and with the many forums about railroad signal collecting whether this is even faint knowledge I was not aware but picked up on the difference however slight .
I think this is rather interesting and a bit important especially in 5 inch where not many signals use the diameter and this makes a difference when discussing semaphore spectacles .
Ironically, this KOPP is in a diameter popular in Train Order spectacles .
KEYSTONE TYPE SH KOPP 6 1/2
There is one question I wondered about with a uncommon roundel made by CORNING these roundels came in 5 inch and 5 3/8 diameter made by CORNING with the rim legend CORNING CVX 2-2-15 but what was seen from the images the forward of the glasses not the legend side (the back),
was seen as a KOPP RDL manufactured glass.
Until actually getting the roundel in my hands that confirmed the CORNING CVX 5 inch YELLOW glass roundel but something is missing from the usual 2-2-15 to 1935 CVX pattern glass which is a single concentric ring of glass near the rim.
Now that the CORNING is verified being in the guise of a KOPP RDL pattern roundel and knowing of other existing examples had my curiosity piqued of the possibility, would a KOPP made roundel take the form of a CORNING CVX?
This KOPP pattern certainly has the familiar concentric ring of glass found on CORNING CVX's and legend on rim is marked KOPP.
It it surmised KEYSTONE is automotive and emergency lighting manufacturer and doubtful as traffic signal manufacturing part.
While nothing about this YELLOW roundel speaks railroad other than looking like a CORNING CVX pattern, there is no railroad signal glass made with recessed pockets into the back rim for retaining clips .
This image just points out possibly something to look out for collecting KOPP glass masquerading as CORNING CVX.
I do not know within railroad collector circles this being general knowledge and with the many forums about railroad signal collecting whether this is even faint knowledge I was not aware but picked up on the difference however slight .
I think this is rather interesting and a bit important especially in 5 inch where not many signals use the diameter and this makes a difference when discussing semaphore spectacles .
Ironically, this KOPP is in a diameter popular in Train Order spectacles .