NYC woman learns sketch hanging in Upper East Side apartment is rare gem from Revolutionary War [Video]

UPPER EAST SIDE, Manhattan (WABC) — A historic piece of artwork has been hanging in an Upper East Side apartment for 40 years – but the owner only recently discovered she was in possession of the rare sketch.

Judith Hernstadt bought the drawing from an antique dealer more than 40 years ago and paid less than $1,000.

Being a collector, she knew it was special, but had not idea just how rare.

“It had an energy to it, was fairly detailed, in terms of what it did have of several figures in the wagon and what it said on it was exciting to me,” she said.

In faint writing, the sketch is said to be soldiers from the North Carolina Brigade of the Continental Army marching through Philadelphia.

Matthew Skic is a curator at Philadelphia’s Museum of The American Revolution.

“She showed it to me and my jaw dropped,” Skic said. “I recognized the details in …