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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.
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