If you’ve seen the popular PBS “Antiques Roadshow,” you know the treasures — prized for their value or purely sentimental — that can lurk in attics and basements. The Islip Arts Council has been hosting its annual antiques and collectibles fair for decades, offering patrons a place to shop for vintage finds or get something they already own evaluated.

About 50 vendors of everything from antique toys and hand- carved picture frames to rare coins and stamps display their wares June 10 on the grounds of Brookwood Hall, a circa 1902 neo-Georgian mansion that now houses the council and its museum.

A highlight of the fair is the appraisal table, presided over by certified art and antiques appraiser Ted Oberg of All American Auctions in Islip, along with a team of colleagues.

It’s a long-standing tradition that fair visitors can receive free on-the-spot verbal appraisals for items they bring with them.

“It’s like a treasure hunt — you never know what will show up,” Oberg says. Several years ago, fair visitor Gerard Cuff brought two paintings he’d inherited from his grandmother.

“I’m old-fashioned,” says Cuff, who lives in Babylon. “I didn’t like the style of those pictures — too abstract, and they’d just been gathering dust in my basement for years. Ted recognized that they’d been painted by an Italian impressionist, Vincenzo Irolli.” Fast forward a few months and they were sold at a Manhattan auction house for about $40,000 each, Cuff says.

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“Another time, we found an original Tiffany lamp worth $20,000,” Oberg says. But there’s a value beyond dollar figures, too.

“We almost always find extraordinary things that are rich in history and nostalgia; sometimes we can bring joy to the owner, but sometimes it’s disappointment,” Oberg says. Like last year, when a fairgoer brought a beautiful Japanese Satsuma ware tea set that turned out to be a $100 reproduction — it wouldn’t fetch the thousands that the originals from centuries ago can bring.