Cambridge police called in special investigators from the F.B.I last night in an attempt to recover a stolen three-pound Magoo original.

Contacted into last night, Brattle Theetor Museum of Fine Arts Director Bryant Holiday '47, from whose charge the work was swiped, reported. "We're desperate. There's a $25 reward posted, no questions asked,"

The Magoo original, eight inches by then inches, formerly hung in the lobby of the Brattle Theater, Brattle Square, Cambridge.