SHANGHAI Industrial Sewing Machine left holders of its B shares with a 62 per cent paper profit after its first day of trade in Shanghai. Strong buying boosted turnover of the sewing-machine manufacturer's shares to 11.8 million, 60 per cent of the total B shares traded on the exchange. The stock opened at 65 US cents and hit a high of 71 cents before closing at 68 cents, 26 cents above the issue price. Brokers said the company had chosen an auspicious day to start trade - the US and China having clinched an agreement on textile trade on Monday night. But they said that while the agreement had helped the stock, it was not the main reason for its big rise in price. Smith New Court Far East broker Newman Mou said recent listings were grabbing the limelight in the market for B shares, which are reserved for foreign investors. ''The market focus today is on Sewing Machine, and the stock has performed as expected,'' he said. ''These days, new B shares will shoot up very high on their debuts. The upward trend will continue for a few days, but profit-taking will then prevail.''