The following pages can help you determine roughly when a Stanley bench plane was made. I didn’t create these pages, but I have added to them. I encourage you to read the history of these pages for some background.
Bench Plane Dating Flow Chart The original plane dating flow chart.
Scope and Limitations: Patrick Leach’s comments on Stanley plane dating.
Acknowledgements from the author: The information in this Web page is derived from a type study done by Roger Smith, in his book “Patented Transitional & Metallic Planes in America.” Patrick Leach reformatted the type study and added comments based on his experience with Stanley planes. I converted the type study to hypertext and added the plane dating flowchart and feature timeline.