The robbery happened at the Wells Fargo Bank at 402 W. Lancaster Avenue on Tuesday, August 9th around 12:47 p.m.
The robber is described as a black male, 6' 4" to 6'5" tall, athletic build in his mid-20s. He was last seen wearing a black hoodie, grey sweatpants, sneakers, dark tinted ski mask and gloves.
He was also carrying a nickel-plated semi-automatic handgun.
Authorities say the man got away with a large amount of cash.
Wells Fargo Bank a reward of up to $25,000 for information leading to the identification, arrest and conviction of the man who committed this crime.
Anyone with information pertaining to this robbery is asked to contact the Citizens Crime Commission Tipline at 215-546-TIPS.
Tipsters can remain anonymous.