Boston Police have released photos of a man they say robbed Marty's, 103 North Beacon St., of an estimated $10,000 on May 28.
Police say the guy entered just after the store opened at 10 a.m. and used a snub-nosed revolver to force the sole employee on duty to open a secured area in the back of the store and remove the money.
This was several days after the guy, wearing the same "faded denim jeans and black sneakers with red soles," took time to case the store, police say.
The suspect arrived and fled on a blue men's mountain bike, police say, adding the employee was not injured.
If he looks familiar, contact detectives at 617-343-4256.