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Pillar of the Community
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gigi2110
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Bedrock of the Community
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I'm not well versed in it, but the SD seems to stand for "Series Doubling" which I take to mean (from the context) that a group of dies exhibits the same doubling. That should be from one working hub, I guess, based on the following clarification: Quote:
Die Markers: Obverse: Will vary among the different working dies that were affected. Reverse: Will vary among the different working dies that were affected.
In Memory of Crazyb0 12-26-1951 to 7-27-2020
In Memory of Tootallious 3-31-1964 to 4-15-2020
In Memory of T-BOP 10-12-1949 to 1-19-2024
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Pillar of the Community
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I know very little about half dollars but it would appear to be a second master die that was put in use, part way through 1971 and had continued use through 1972. So, this would be a doubled master die that carries through all the working hubs and working dies, that is why there can be several different types of markers on different coins but have the same doubling. Similar to the 1972 Lincoln Cent master die doubling. I made a diagram awhile back that shows how a doubled working hub works in the pic below, but imagine it one step higher, where the master is doubled, then everything below it will have the same doubling but could have different die markers.  -makecents-
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Bedrock of the Community
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Pillar of the Community
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Thank you spruett001  and mikecents that diagram help me a lot. But let's see if I understand well for future reference, so basically doubling master die and doubling working hubs is the same thing right? I believe I found one like that WSDO-001 last night, I will upload images later, maybe you can help me to confirm if is the same doubling. gigi2110
Edited by gigi2110
10/20/2024 10:21 am
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Pillar of the Community
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Coinfrog gigi2110
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Pillar of the Community
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gigi, read the link below in its entirety and this may help a little more. Up until 2008, a coin design started with the galvono, a hand carved likeness of what the coin would look like. From that a master hub was made, then a master die, from the master die there are several working hubs made, then from each working hub, there are several working dies made from each working hub. So, this creates a domino effect, when doubling occurs up the line, the further up the line, the more doubling will be seen on coins. That is why doubling from master dies and working hubs is pretty much worthless, because there are so many coins with the doubling. It's not until there is a doubled die that is made when the working hub is creating a working die and doubling occurs, then there is only doubling on coins from just that single working die, a "doubled die". Hope this helps. So once again, please read from the link below. How dies are made. https://doubleddie.com/58201.html-makecents-
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very nice makecents! I like that diagram
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Pillar of the Community
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Thank you for the explanation and for the link makecents!!  yes I definitely will read it. Dearborn gigi2110
Edited by gigi2110
10/20/2024 11:14 am
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Quote:
I made a diagram awhile back that shows how a doubled working hub works in the pic below... Excellent! |
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Posted 10/20/2024 08:11 am
