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EL84, MULLARD, NEW SHIELD, MATCHED PAIR, SIMILAR FACTORY CODE kM1 B1L1, kM1 B1L2, BLACKBURN NOVEMBER 1971 MANUFACTURE

MATCHED PAIR, SIMILAR FACTORY CODE kM1 B1L1, kM1 B1L2, BLACKBURN NOVEMBER 1971 MANUFACTURE

Envelopes shows good white print and superb inter valve matching

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