DUBAI] - Kuwait's Ahli United Bank has sold $600 million in Additional Tier 1 Islamic bonds at 3.875%, a document showed on Wednesday.

Pricing on the bond tightened from an initial price guidance of around 4.375% after the debt sale attracted more than $1.7 billion in orders, the document from one of banks on the deal showed.

Additional Tier 1 (AT1) bonds are designed to be perpetual in nature, but issuers can redeem or "call" them after a specified period. Ahli United Bank's AT1 sukuk will be non-callable for 5-1/2 years.

Kuwait's Ahli United, nearly three-quarters owned by Bahrain's Ahli United Bank, hired Citi, HSBC, Standard Chartered, Abu Dhabi Islamic Bank, Kamco Invest, KFH Capital and Kuwait International Bank to arrange the deal.

(Reporting by Yousef Saba; editing by Jason Neely and Jane Merriman) ((Yousef.Saba@thomsonreuters.com; +971562166204; https://twitter.com/YousefSaba))