B0459 and B0455 were built in 1988, the time of the first EMC TSX series... and much too early for the Motorola pattern - perhaps the frames waited longer to be sold...and were later repainted. If you added the other markings (the serial number is on the right side of the BB cover, the "technical" markings on the left side) there would be more information about your frames - by the way: the Scandinavian (and especially Swedish) market was very important for EMC, hence the cooperation with the Faglum brothers (Crescent)

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