A four-pin plastic base. Tipless S-shaped envelope with internal getter stain. Stamped on envelope: "B98 / [?????] / for use only / Made in [?????]", on base: "B98". The PM4 marking does not appear on ...
A four-pin plastic base (banana pins). Tipless S-shaped envelope with internal getter stain. Unit is not in the original box. Box is for an "Ever Ready Gaslighter Battery / U.14 / Price 2/6 / A ...
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