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Jackson Booking Office
World Junior Middleweight Championship
(1927 — 1931)
World Junior Middleweight Championship
(1927 — 1931)
| Won By: | Date: | Event: | Location: | Reign: |
|---|---|---|---|---|
| Gus Kallio | 1927 | -- | -- | |
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Recognized as champion in Mississippi in November 1927.
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| ** Vacated ** | Jan 26, 1929 | -- | -- | |
| Yaqui Joe | May 10, 1929 | Live Event | Jackson, USA | 7 days |
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Defeated Billy Romanoff in the final of a tournament for the title.
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| Joe Kopecky | May 17, 1929 | Live Event | Jackson, USA | 308 days |
| Dutch Mantell | Mar 21, 1930 | Live Event | Jackson, USA | 56 days |
| Gus Kallio [2] | May 16, 1930 | Live Event | Jackson, USA | 7 days |
| Joe Kopecky [2] | May 23, 1930 | Live Event | Jackson, USA | 301 days |
| Yaqui Joe [2] | Mar 20, 1931 | Live Event | Jackson, USA | 7 days |
| Joe Kopecky [3] | Mar 27, 1931 | Live Event | Jackson, USA | |
| ** Vacated ** | 1931 | -- | -- | |
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After Kopecky moves up to the middleweight division.
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