Sept 14 (Reuters) - Seven West Media Ltd SWM.AX :
* Seven West Media announces on-market buy-back SWM.AX
* Seven West Media announces $75 million on-market buy-back
* Buy-back will be effected over the coming twelve months
* Should Seven West Media fully complete the proposed share buy-back, leverage is forecast to remain under 2.1x this year
* Says earnings outlook and guidance remains unchanged
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