Researching High-Standard serial numbers is a nuanced process. While charts provide a roadmap, the specific history of the company—specifically the transition from Hamden to East Hartford to Houston—means that the slide markings and specific features are just as important as the number itself. Use the chart above as a starting point, but always cross-reference with observed features like barrel weight, sight cuts, and slide markings to get the full picture of your firearm's history.