Shares of menswear retailer and manufacturer, Koutons Retail gotlisted at the National Stock Exchange (NSE) at Rs 510 a share, apremium of nearly 23% over the issue price of Rs 415 a share.The scrip soared to a high of Rs 620 in the early minutes of trading even as the markets opened weak. The stock touched a low of Rs 502.More than 20 lakh shares of Koutons Retail changed hands at the NSE. At 1010 hrs, the scrip was trading at Rs 599.