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- Serial number are found on the rear, non-drive gusset and are in the Koizumi standard 6 digit format followed by a Kanji (baseball).
- Serial numbers will begin 9, 0 and 1 – 1979, 1980, 1981 only
- 1981 models will have a 1 followed by A, B or C, for January, February, March.
- By April 1981 the model was replaced with the Senior Pro.
- See details on that page for more.
- Model production run was from 1979 to April 1981
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