17tp4 crt

[Electronic M]

IIRC that is a 17" rectangular type. Most metal CRTs were round the rectangular ones were among the last* before the metal CRT fad faded (presumably due to metal-glass joints increasing vacuum leakage issues).

*Color CRTs which were developed at the end of the metal CRT era and HAD to have a metal joint to install the shadow mask (until the frit glass method came out) were probably the real last metal cone CRTs made.