LostDutchman Posted November 17, 2005 Report Share Posted November 17, 2005 Doubled Die – Dies are made in a very similar process to coins. They are stamped, or hubbed by a master die called a hub. They are hubbed 2 or more times to make sure all the design elements are present and will stand up to the pressing of hundreds of thousands of coins. Between each hubbing they are annealed. There are 6 classes of double dies. All 6 will be explained here. Class I Doubled Dies (Rotated Hub Doubling) - This type of doubled die happens when there is a rotation between the first and subsequent hubbings. This causes a clockwise or counter clockwise rotation in the design on the die and al the coins stamped with this die will show a rotated doubling. Class II Doubled Dies (Distorted Hub Doubling) - This type of doubled die happens when the dies are heated between hubbings. The metal expands when heated and supposed to contract when cooled. Sometimes this does not happen and the next hubbing is smaller in diameter then the last. This causes a doubling towards the center of the coin or the edge of the coin from the center. Class III Doubled Dies (Design Hub Doubling) - This type of doubled die happens when a die receives hubbings from 2 different hubs that contain different design elements. The best example of this is the 1960 large/small date coins. This form of doubling is also responsible for overdates including 1918/7-D Buffalo nickel, 1942/1 and 1942/1-D Mercury dimes, and the 1943/2 Jefferson nickel. Class IV Doubled Dies (Offset Hub Doubling) - This type of doubled die happens when the dies are returned to the hubbing press after being annealed. They are returned to the press and the center of the die and the hub are not lined up. This doubled die looks very similar to a coin that is double struck and the second strike is just slightly off center. Class V Doubled Dies (Pivoted Hub Doubling) - This type of doubled die happens when a die pivots along the rim. This will show stronger doubling adjacent to the area the dies pivoted on. Class VI Doubled Dies (Distended Hub Doubling) - This type of double die is very different from the ones discussed earlier. This type of doubled die happens when the die is annealed before the initial hubbing and is made too soft. Causing the hub to go deeper into the metal and making some design elements larger and adding extra thickness to the letters. Quote Link to comment Share on other sites More sharing options...
josie Posted October 22, 2006 Report Share Posted October 22, 2006 This section is one of the hardest to comprehend a lot of surfing in the net and reference books, Good info dutch form time to time I visit your article,Thank you Quote Link to comment Share on other sites More sharing options...
LostDutchman Posted October 23, 2006 Author Report Share Posted October 23, 2006 your very welcome! glad I could help! Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.