Dating english patent numbers
There are 18 references cited in this article, which can be found at the bottom of the page.
Each patent, whether issued by the United States Patent and Trademark Office or another country’s patent office, has a unique number that distinguishes it from any other patent.
You must use the serial number from the MOVEMENT of the watch... You usually have to take the back off the watch case to see the movement serial number which may appear anywhere on the watch movement. Be sure to use the serial number on the watch movement (the mechanism).
At first glance they look the same but if you look closely you can see that some have a number at the right hand corner and some have a letter.
You can ignore the number at the bottom of the diamond - this tells us how many items were included in the registration, (sometimes known as bundles or packages).
The following tables provide a summary breakdown of identifying characteristics and markings of the Bodies, Frogs and Receivers, Lateral Adjustment Levers, and Lever Caps on Stanley’s Bailey line of bench planes.
Features are broken down by type. These tables provide a helpful quick reference guide for identifying type.