Surveillance cameras caught the robber as he calmly walked into the Switch Watch Gallery store in Mission Viejo Wednesday night.
He tried on several watches before lifting his shirt to show the saleswoman a black handgun tucked into his waistband. He then put five Cartier watches inside a blue bag and strolled away.
If you have any information that could help investigators, please call Orange County Crime Stoppers at (855) Tip-OCCS.