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“Manchester-by-the-Sea,” starring Michelle Williams and Casey Affleck, has locked down financing with Sierra/Affinity launching international sales at next week’s Berlin Film Festival.

Kenneth Lonergan is directing from his own script with shooting slated to begin in March in Massachusetts.

Matt Damon is producing through via the Pearl Street Films banner along with Kimberly Steward, who has come on board to produce and finance through her new production entity K Period Media, Chris Moore via his CMP banner and Kevin Walsh through the B Story production company. K Period Media’s Lauren Beck and Josh Godfrey will Executive Produce.

Affleck will portray a man granted custody of his teenaged nephew after his older brother dies. Williams will portray his estranged ex-wife.