(BCN) -- A Contra Costa County Superior Court jury on Wednesday convicted a 27-year-old Oakland man on four counts of armed robbery for stealing high-value watches as well as for possessing a firearm as a convicted felon, prosecutors said. Shane Ivan Downs was charged with seven felonies related to a series of armed robberies in 2020 and 2021. In each incident, a masked Downs followed his victims from a public place to their homes, where he robbed them at gunpoint -- usually of high-end watches worth $3,500 to $15,000. On April 18, 2021, Downs followed a victim from Walnut Creek to her home in Oakley, where he flashed a handgun and stole her Rolex watch. Burlingame landlord threatened to evict renters for having baby, investigators say Later that day, he followed another victim from Walnut Creek to Concord, where he pointed a gun at the victim's head, struck them, and robbed them of a Panerai Luminor watch. On May 24 of that year, Downs followed a third victim from Danville to Walnut Creek, then robbed them of their Rolex at gunpoint. Six days later, Downs followed another victim from a Walnut Creek shopping area to the victim's home, where he again brandished a gun and stole a Tag Heuer watch, prosecutors said. The Contra Costa County District Attorney's Office said Thursday it built its case against Downs through vehicle information, search warrants, cellphone records, and surveillance. Despite a similar mode of operation to the four other robberies, the jury didn't find sufficient evidence to convict Downs of charges related to a July 2020 robbery in Orinda. Prosecutors said Downs faces potentially significant state prison time for his offenses. He's scheduled for sentencing at 1:30 p.m. Nov. 15 in Martinez. Copyright © 2024 Bay City News, Inc.