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Dec 30 (Reuters) - Hammerson Plc
* Hammerson to sell 50 pct of Watermark development in Southampton, UK to GIC
* Deal for a total consideration of 48.5 million stg.
* Hammerson to sell 50 pct of Watermark to GIC Source text for Eikon: Further company coverage: (Bengaluru Newsroom: +91 806 749 1136)