According to a news release from MVPD, the robbery was reported at 11:18 a.m. at the Bank of the West location on E. Blithedale.
"Without delay Officers arrived on scene and established a perimeter around the bank," the statement says. "After contacting the bank employees, it was determined that the suspect had already fled the scene on foot with an undisclosed amount of cash. "
Police searched the area, but didn't find the man, who is described as white, about 30 to 45 years old, 5 foot 8 inches to 6 feet tall, with possible facial hair in the form of a goatee or stubble.
During the hold-up, no weapon was seen, but police think the man may have been in possession of a black handgun. He passed a note to the teller to get the money, police said.
"The suspect was last seen headed northbound through the parking area toward Ashford Ave.," police said.
A surveillance camera caught an image of the man, which is attached to this report. He was wearing a blue jacket or windbreaker with a hood and white or silver stripe across the chest, blue jeans, dirty work boots/shoes, support bandage or brace on left hand/wrist.
Anyone with information is asked to contact the Mill Valley Police Department Investigations Unit at 415-389-4100.