(1) STC (Standard Telephone and Cable) of England VLS631 Thermal Relay Tube with Original Box.
Made in England (United Kingdom).
The box has old tape residue and a small bit of writing on both tab ends - see photos.
This tube was tested for filament continuity (good) but has not been tested beyond that. So it is being sold as untested since the full working condition is unknown, therefore it is being sold as is described and pictured.
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