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The ZM1020 is a numerical indicator tube with red filter on the glass. The electrically identical ZM1022 has a clear glass dome.

This indicator was made in Holland by Philips.

The envelope is also marked as CV5278 and the original box was dated January 1974.

The hexagonal anode mesh with the numeral shaped cathodes stacked below.

Oblique view.

The thin glass tube envelope is 28 mm in diameter, and excluding the B13B base pins is 26 mm tall.

Reference: Data-sheet.

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.