A 56-year-old woman was attacked on Fifth Avenue and 52nd Street Sept. 9.
Cops said another woman bumped into her at 7:30 a.m., hit her in the face with an umbrella and fled east on 52nd Street.
The victim was treated for cuts on her ear at NYU Langone Hospital-Brooklyn.
The suspect is white, 5-foot-2 and 120 pounds. She has long hair and was wearing dark clothes.
The 72nd Precinct said anyone with information can direct message @nypdtips on Twitter or anonymously call 800-577-TIPS.