Dec 24 (Reuters) - Richfield International Ltd RIS.AX :
* Take no action on takeover offer
* Received a bidder's statement from Mercantile OFM Pty Ltd
* Offer in respect of an unsolicited on-market takeover offer (offer) for all of the issued shares in Richfield
* Says under the offer Mercantile OFM Pty Ltd is offering 20 cents per Richfield share
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