HANOI, Sept 29 (Reuters) - Vietnam's rice exports in the January-September period are estimated to have risen about 23% from a year earlier to 6.6 million metric tons, government data showed on Friday.

Revenue from rice exports in the period is seen up 40% at $3.7 billion. September rice exports from Vietnam, one of the world's leading shippers of the grain, were estimated at 800,000 metric tons, worth $495 million. (Reporting by Phuong Nguyen; Editing by Martin Petty)