The robbery happened at 8:13 a.m. on December 23, 2013.
According to police, the suspect entered the Prudential Savings Bank located at 28 North 3rd Street and handed the teller a threatening demand note.
The man obtained an undisclosed amount of money and then fled the building.
The suspect is described as a white male, mid to late 20's, 5'7", thin build, wearing a "Carhartt" tan jump suit, dark gloves, red hooded sweatshirt and a red Phillies baseball hat.
Anyone with information is urged to contact Philadelphia Police at 215-686-TIPS (8477), text a tip to PPD TIP (773847) or through PhillyPolice.com.