Posted 04/18/2017 6:20 pm
The Master hubbings were constantly being changed, not every year was continued on into the next, particularly on each separate hub used. Here's an explanation on hubbing from Chuck Daughtery from Coppercoins, then the link on which I found it:
http://goccf.com/t/86764
Read up, I think you're seeing the differences in how the Master Dies are put together.
Quote:
Dies start out with a conical shape to the coining surface. As the hubbing happens, the design elements impress into the center of the die first, then work toward the outside edge of the die. During the multiple hubbing days, it was very common for dies to go into the oven for their first post-hubbing annealing with only the center 10-20% of the design hubbed into the die. If that hubbing is off, then all the other hubbings are on, we end up with a coin that shows doubling only in the center of the design and nowhere else. The 1984 doubled ear is one of the best examples of this.
Class 8 hub doubling, or 'tilted' hub doubling describes doubling that takes effect because the hub is not plumb with the die when it impresses design into the die. This catches just one edge of the die doubling some feature around the edge of the design only. The 1963D doubled die with the doubled 3 of the date is one of the best examples of this class of doubling, as is the first piece discovered with this class, the 1964 doubled die on which only the L of LIBERTY and the word IN are doubled. This die at one time was referred to as 1964 1c 22-O-VIII. I'm not sure what the current die numbers are...but this was the first die classified as a class 8 tilted hub doubled die.
Another exception is in the newer class 9 'shifted hub doubling' doubled dies where the hub and die start out slightly out of alignment, and with the pressure of the hubbing the die snaps into place, and the hubbing continues. This class of doubling generally only shows in the very center of the design, and is basically limited to the single squeeze die production technique known to have been used at least from 1997 to present. All of the doubled column Lincoln cents and all of the Statehood Quarter doubled dies are class 9 doubled dies,
Dies start out with a conical shape to the coining surface. As the hubbing happens, the design elements impress into the center of the die first, then work toward the outside edge of the die. During the multiple hubbing days, it was very common for dies to go into the oven for their first post-hubbing annealing with only the center 10-20% of the design hubbed into the die. If that hubbing is off, then all the other hubbings are on, we end up with a coin that shows doubling only in the center of the design and nowhere else. The 1984 doubled ear is one of the best examples of this.
Class 8 hub doubling, or 'tilted' hub doubling describes doubling that takes effect because the hub is not plumb with the die when it impresses design into the die. This catches just one edge of the die doubling some feature around the edge of the design only. The 1963D doubled die with the doubled 3 of the date is one of the best examples of this class of doubling, as is the first piece discovered with this class, the 1964 doubled die on which only the L of LIBERTY and the word IN are doubled. This die at one time was referred to as 1964 1c 22-O-VIII. I'm not sure what the current die numbers are...but this was the first die classified as a class 8 tilted hub doubled die.
Another exception is in the newer class 9 'shifted hub doubling' doubled dies where the hub and die start out slightly out of alignment, and with the pressure of the hubbing the die snaps into place, and the hubbing continues. This class of doubling generally only shows in the very center of the design, and is basically limited to the single squeeze die production technique known to have been used at least from 1997 to present. All of the doubled column Lincoln cents and all of the Statehood Quarter doubled dies are class 9 doubled dies,
http://goccf.com/t/86764
Read up, I think you're seeing the differences in how the Master Dies are put together.
Edited by Crazyb0
04/18/2017 6:28 pm
04/18/2017 6:28 pm
