** Shares of luxury watch retailer Watches of Switzerland Group WOSG.L rise as much as 7.7% to 486p
** Stock among top gainers on FTSE midcap index .FTMC, which is up 0.17%
** London-listed co announces share buyback of 25 million pounds ($32.21 million)
** Says new 150 million pound refinancing increases group liquidity headroom by 50 million pounds
** Up to Friday's close, stock fell 19.4% so far this year
($1 = 0.7761 pounds)
(
Reporting by Simone Lobo in Bengaluru)
((Simone.Lobo@thomsonreuters.com; +919920570373;))