This one was imported and branded by Tedelex, the then importer of all things Casio, Sony and others.
11 digit (10 + sign) Vacuum Fluorescent Display.
It might have been the property of the SABC at some point.
The main chip is a NEC uPD979C.
The display driver is a NEC uPD975C.
John Wolff has the specifications.
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