For the second time in just over a year, Washington Mutual Inc.'s investments unit will undergo a makeover after an acquisition by its parent.

On Jan. 1, Wamu, as the Seattle thrift company is known, plans to integrate Griffin Financial Services, the brokerage unit of H.F. Ahmanson & Co., into its WM Financial Services unit. Griffin brings 180 Series 7- licensed brokers to Wamu, boosting its sales force to 480, said J. Pamela Dawson, president of WM Financial Services.

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