The global trading arm of the over USD 103 billion Tata Group, Tata International, has raised 150 million Singapore dollars in an overseas bond sale, priced at 6.65 percent. This is the first-ever perpetual bond issuance in the Singapore debt market by a domestic company, as also the largest sole-advisor led transaction from country in recent years, according to the merchant banker HSBC. The issue got close to seven times over-subscription, enabling the company to tighten pricing to 6.65 percent, HSBC said.