LOWELL -- A 62-year-old Stoneham man was placed on probation for six months after admitting to impersonating a police officer by flashing a Middlesex County sheriff's badge that hasn't been valid since the 1970s, officials said.

In Lowell District Court Tuesday, Lawrence Bowman, of 15 Lee St., admitted to sufficient facts to impersonating a police officer during an incident on June 5, 2013.

His case was continued without a finding for six months while on probation. If he has no further legal issues, the case will be dismissed.

Chelmsford police say they were en route to another call when they were flagged down by a motorist in a pickup truck on Route 3 south.

The driver pointed to a brown 2005 Toyota Corolla, saying the driver was driving erratically and flashed a badge.

Police questioned Bowman, who gave the officer his license, registration and a Middlesex sheriff's badge. Bowman allegedly kept telling the officer he was just trying to get the truck driver to slow down.

In examining the badge, the officer noticed the issuing party was former Sheriff John J. Buckley III, who was Middlesex sheriff from 1970 to 1980.

Buckley died in 1994 at age 64.

When questioned about the badge, Bowman allegedly said he left the sheriff's department in the 1970s because the job was not for him.

Bowman was told it is illegal to pose as a member of law enforcement.