Each machine, regardless of its class or model, was assigned a consecutive factory number. When the above plan of numbering was abandoned, a regular sequence was maintained. The intervening numbers were assigned other models. Thus, as will be noticed, a model will have several groups of serials numbers, sometimes in the same year of manufacture. Burroughs portable adding machine serial number series#The practice was to reserve a series of 1,000 to 5,000 numbers (more or less) and assign them to one model, and when that series was exhausted, a new set in a different series would be assigned. Until 1914-1915, Burroughs machines were not numbered in sequence. Burroughs portable adding machine serial number serial numbers#It will be noted that the serial numbers of all early models are comparatively low - in all cases less than 260,000 the approximate lowest serial number of machines with class designations. To provide against the possibility of any confusion in identifying early models from those of modern construction having similar model numbers designations, the serial numbers assigned to each of the early models are listed below in detail. "The serial number is stamped on the front of the base of every machine. This information about Burroughs serial numbering in the early years has been taken from the The American Digest of Business Machines (1924) If you have a Burroughs Portable Adding Machine, use the tables in the section following the Class 1, 2, and 3 machines. Write me at: The following tables cover the Class 1,2,3 machines only. You can check below to see if your serial number is within the description and tables. If that is the case, you will have to send a picture and the serial number to me, and I will be able to help you with a rough idea of the date. If your machine was built after that, you will notice that the serial numbers in the tables are smaller then your machine's serial. These table will only provide manufacturing date information if your machine was built before 1924. Using the tables below, you can then identify the year of manufacture of your machine. So a serial number like 4-12762 would indicate a Class 1, Model 4 machine. Generally, these machines had a prefix to the serial number that describes the model or style. You will also need to identify the model or style of the machine from the descriptions in the information provided. The manufacturing date of early Burroughs Class 1, 2, and 3 machines can be identified by the serial number on the front of the machine. Some later model portable adders had the serial attached to the base of the machine, in the very front. Portable Adding Machines - usually on the green keyboard plate, at the bottom center, just below the row of 1's keys. Low Keyboard machines - lower front just below the case lock key hole. High Keyboard machines - lower front just below the case lock key hole. Locating the serial number is generally easy to do. At the very end is information about the Class 8 and 9 (Portable) adding machines. The information below will help you to find dates of the early Class 1 and 2 (high keyboard) machines. Serial numbers are critical to the process of learning about the age of your Burroughs.
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