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2004 D Keelboat MS65 struck on sintered planchet
mathpark
Posts: 16 ✭
Hello all,
I’m posting this because people need to see it 🤓 Back in 20004 I found this 5c at a gas station I was working nights at in college. Well anyway I’m trying to understand Sintered Planchets more than I already do. My question is, why do some sintered planchet coins appear shiny silver with copper (1) and some appear burnt? I will post 2 pictures to show my meaning. Both from the D mint 2004 keelboat and peace. Happy hunting any info is much appreciated!
1
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Now, they are called Improperly Annealed Planchet errors.
Is that D mint CTF?
Yes... as @ErrorsOnCoins said... No coins/planchets are sintered... total misnomer. To be specific "Sintering is a heat treatment process in which a large quantity of loose aggregate material is subjected to a sufficiently high temperature and pressure to cause the loose material to become a compact solid piece." Cheers, RickO
Well said Rick so who? And how can this misnomer be fixed?
publications changing what it published would be a start
@mathpark ... We need to correct it whenever we see the term used... be it on a forum, at a show, at a shop or at a coin club. Cheers, RickO
To me it’s like calling a Honda a Ford. It’s not sintered it’s reforged if I’m understanding what you said. Which was an excellent way I might add. Thank you
Improper annealing is due to variations in the heat treating (annealing) furnace. Incorrect time, temps, and/or reducing atmosphere (oxygen levels) can cause this type of error.
Oldhoop I know what it is, but it seem to me we have given a error the wrong description? No doubt it is this heating process that causes this.
If a coin gets miss struck our struck through an object such as grease for example. I don’t know the term I believe it says “struck through grease”? Taking my 2 examples one is shiny what makes it shiny? Why would the other be very dark in color vs. the shiny copper on outside?
Oh I c it’s the change in atmosphere among the thousands in the same process that cause the huge variety of different looking improperly annealed coins. Perhaps a “variety” marker??