** Shares of Vishal Mega Mart VSSL.NS fall 7% to 118 rupees
** Promoter Samayat Services is likely to sell a 6.5% stake in co via block deal, The Economic Times reports
** Block deal shows 673.8 mln shares traded hands - exchange data
** Stake sale at floor price of 115 rupees apiece, a 9.8% discount to co's closing price on Thursday
** VSSL and Samayat did not immediately respond to Reuters requests for comment
** Stock trims YTD gains to ~6.5%
(Reporting by Yagnoseni Das in Bengaluru)
((Yagnoseni.Das@thomsonreuters.com;))