MADEIRA BEACH, Fla. — For nearly three decades Ken Perenyi made a small fortune forging works by popular 18th- and 19th-century artists like Martin Johnson Heade, Gilbert Stuart and Charles Bird King.

Then in 1998, Mr. Perenyi says, two F.B.I. agents showed up on his doorstep, curious about a couple of paintings sold at Christie’s and Sotheby’s, ostensibly by the maritime artist James E. Buttersworth but actually his own meticulous creations.

Over the next few years, he says, the F.B.I. continued to keep a close watch on him at his bayside bungalow here, tracking his work and where it sold, and talking to his friends and associates. Though the authorities never charged him, the scrutiny pushed Mr. Perenyi to develop what he calls “a new business model”: openly selling his faked oils as the reproductions of the finest masters.

Now they are bought by Palm Beach decorators, antiques dealers, professionals, business executives and others who want the look of cultured gentility without the price tag.