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Mullard S4VA box

S4VA exhibit
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This S4VA box although badly damaged shows packaging from the late 1920s or early 1930s.The box is printed cardboard, inside the valve is protected by a shaped card insert. The box is 88 mm square and 174 mm tall. The valve in the box was metallised but our other S4VA box is overprinted with the word metallised, suggesting that this originally contained the plain glass S4VA.


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