Dating glass backstamps
Dating glass backstamps - sex dating in mount juliet tennessee
The ™ symbol indicates a manufacturer considers the mark to be a trade mark but it has not been registered Diamond marks were printed, engraved or otherwise marked on a design – for example on the underside of china or the reverse of printed fabric.The mark was in the shape of a diamond with numbers and letters marked at specific points to represent: More contemporary trademarks include symbols or icons such as those used by Nike and Apple, and sounds or jingles such as the Intel and Nokia tunes.
Use this guide if you are trying to find out about an item with a diamond mark but you don’t have the registered design number.For example, if you have a letter in the left point of the diamond and a number on the right, then it falls into the 1842-1867 range.If the number is on the left and the letter on the right it is in the 1868-1883 range.If you know the registration number you can browse the relevant record series in the catalogue to find the right range.For example, if you are looking for registration number 20300, you will find it in BT 82/82 which has the range 20251-20500.This means that the letters and numbers used to represent dates are at different points of the diamond between 1842-18-1883.
The mark at the top of the diamond was a Roman numeral representing the material the item was made from. Use the examples below to work out which date range corresponds to the diamond mark on your item.The trademarks are not individually described in the catalogue.Instead, they are listed in ranges of registration numbers.The National Archives collection is far from complete, but this guide will suggest supplementary sources for researching trade marks.Diamond marks were issued by the Patent Office between 18.They were issued with the registration number when a design was registered.