It happened on January 18 at the Ultimo Coffee Bar located at 1900 South 15th Street.
Police say the gunman walked into the coffee bar at 9 p.m. and pulled a handgun on the clerk behind the counter, demanding money.
He can be seen on surveillance walking behind the counter and grabbing money from the employee before walking to a rear register and taking money from there.
The robber then exchanged some words with the clerk before fleeing west on Mifflin Street.
There were no reports of any injuries.
VIDEO: Click here to watch the surveillance video
The suspect is described by police as a black male, 20 years-old, 6'0" tall with a thin build and beard. He was wearing a dark gray hooded sweatshirt, gray North Face jacket and a light blue coat.
If you see this suspect, do not approach him and call 911 immediately.
To submit a tip to police, call 215.686.TIPS (8477) or text a tip to PPD TIP (773847).
You can also submit an anonymous tip online at PhillyPolice.com.
All tips will remain confidential.