The incident happened on July 26 at the Entree BYOB Restaurant located on the 1600 block of South Street.
Surveillance video shows the thief walking into the restaurant around 12:40 a.m. with a female companion.
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As she heads into the restroom, he waits around for a few seconds before casually grabbing the purse.
He then dances before stuffing the purse down the front of his pants.
Police describe the suspect as a male with a tattoo on the back of his neck and on the back of his left leg.
The woman who was with him is being called a person of interest.
Anyone with information should call police at 215.686.TIPS (8477) or text a tip to PPD TIP (773847).