New surveillance images of the suspect who police believe is responsible for 23 knifepoint robberies since March 1 could increase the chances of identifying the serial bandit, an NYPD spokesman said Monday.

The face of the masked man was recorded on surveillance equipment during the robbery Sunday of the Subway restaurant at 61-13 Springfield Blvd.

An NYPD spokesman on Monday said the video provided among their best images, including one that shows a mustachioed man’s facial structure. Asked if the photo might increase the chances of positive identification, the spokesman said, “With that picture, I would think so.”

NYPD said the suspect entered the Subway in Oakland Gardens at about 3:11 p.m. Sunday and demanded money from the cashier. He flashed a knife and walked around the counter, where he took $500 from the register before leaving the store and fleeing, police said.

It’s the sixth such robbery in Queens since May 11, and NYPD and local detectives think the same man has committed 17 similar robberies on Long Island — 13 in Nassau and four in Suffolk. The FBI is assisting in the investigation.

The suspect in the pattern has been described as 25 years old, about 6 feet tall with a medium build, most often wearing a dark hooded jacket, blue jeans and tan work boots. He usually covers his face with dark sunglasses and a dark cloth, police said.

Witnesses have described him carrying a large butcher knife, which police have said is uncommon in this type of crime.

The NYPD has dubbed the string of robberies citywide crime pattern 90, which began in Nassau County.

The NYPD said the same suspect struck Friday at a Subway at 64-29 108th St., taking about $300. On Wednesday, he also hit a Subway at 205-12 Northern Blvd. in Bayside, making off with a register drawer containing $400.

The most recent similar robbery on Long Island was in Suffolk at a Subway on May 18 in North Lindenhurst.

Plainclothes and uniformed NYPD officers have been stationed near major highway entry and exit ramps close to small businesses, because many of the heists on both Long Island and Queens have taken place near major roadways.

With Laura Figueroa