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ECC33, MULLARD, BLACK BASE, WHITE BOX, FACTORY CODE, 1324I2

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CV2821, MIL SPEC ECC33, MULLARD, BROWN BASE, 5K B5F, BLACKBURN 1955 PRODUCTION

ECC33, MULLARD, BLACK BASE, FAINT PRINT, WHITE BOX,

ECC33, MULLARD, BLACK BASE, NEW, WHITE BOX, FACTORY CODE, B24J2

ECC33, MULLARD, BLACK BASE, WHITE BOX, FACTORY CODE, 1324 C3

ECC33, MULLARD, BLACK BASE, WHITE BOX, FACTORY CODE, 1324I2