This box is made from printed card. The card is printed in two colours, red and black and the operating characteristics appear on the base end. This box has become un-glued and so the construction can be seen. Internally there are two card platforms to hold the top and base of the valve. The box is 75 mm square and 142 mm tall.BSA Radio sourced their valves from STC and this is clearly indicated on the box.
 
 
 
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