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Why Did These Pennies Weigh Different?

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 Posted 06/08/2023  10:05 pm Show Profile   Bookmark this topic Add TwuistdWife to your friends list Get a Link to this Message
I have a 2009 penny that has Abe on a log reading a book and it weighed in at 2.7g, I weighed a 1983 penny and it was also 2.7g, but the rest of my pennies weighed 3.3......what is up with that?
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 Posted 06/08/2023  10:12 pm  Show Profile   Bookmark this reply Add nick10 to your friends list Get a Link to this Reply
the cent's weight was reduced in 1982
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 Posted 06/08/2023  10:12 pm  Show Profile   Bookmark this reply Add surfacewave to your friends list Get a Link to this Reply
Maybe this can help u

Years Material Weight
(grains) Weight
(grams)
1793-1795 ~100% copper 208 grains 13.48
1795-1857 ~100% copper 168 grains 10.89
1856-1864 88% copper, 12% nickel (also known as NS-12) 72 grains 4.67
1864-1942 bronze (95% copper, 5% tin and zinc) 48 grains 3.11
1943 zinc-coated steel (also known as 1943 steel cent) 42 grains 2.72
1944-1946 gilding metal (95% copper, 5% zinc) 48 grains 3.11
1947-1962 bronze (95% copper, 5% tin and zinc) 48 grains 3.11
1962 - September 1982 gilding metal (95% copper, 5% zinc) 48 grains 3.11
October 1982 - present copper-plated zinc (97.5% zinc, 2.5% copper) 38.6 grains 2.5
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 Posted 06/08/2023  10:28 pm  Show Profile   Bookmark this reply Add MisterT to your friends list Get a Link to this Reply
Looks like your scale may need a small calibration adjustment. Appears to be reading .2 grams over weight. The zinc cents should weigh 2.5 grams (your scale measures 2.7 grams) and the copper cents should weigh 3.11 grams (Your scale measures 3.3 grams). Also please keep in mind that some of the 2009 cents were made of the old 95% copper alloy and will weigh 3.11 grams. Those are only found in the proof sets and satin mint sets of 2009, not the regular circulation strikes which will weigh 2.5 grams.
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 Posted 06/08/2023  10:31 pm  Show Profile   Bookmark this reply Add Hondo Boguss to your friends list Get a Link to this Reply
It seems that I have to calibrate my scale every time I use it. That's why I bought a set of calibration weights.
Inordinately fascinated by bits of metal with strange markings and figures
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 Posted 06/08/2023  10:57 pm  Show Profile   Check Dearborn's eBay Listings Bookmark this reply Add Dearborn to your friends list Get a Link to this Reply

Quote:
It seems that I have to calibrate my scale every time I use it. That's why I bought a set of calibration weights.

your scale should have a 'zero' button, mine does (labeled with a 'T' and every time I turn it on I have to hit it with nothing on the scale and zero it out. If you have a fan blowing on it, that can change the weight too.
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 Posted 06/08/2023  11:16 pm  Show Profile   Bookmark this reply Add datadragon to your friends list Get a Link to this Reply
Sounds like you got the answers that your scale appears a bit off, the 2009 if circulated and the 1983 should weigh typically 2.5g, while pre 1982 cents would weigh typically around 3.11g. However there is some variance in weights naturally that is normal once your scale is recalibrated or you get a new one that has a calibration weight to start .







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 Posted 06/09/2023  01:58 am  Show Profile   Bookmark this reply Add sel_69l to your friends list Get a Link to this Reply
1944 to 1946 shell casings were recycled to be made into pennies.
These shell casings were made of gilding metal, (95% copper, 5% zinc).
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 Posted 06/09/2023  04:28 am  Show Profile   Bookmark this reply Add John1 to your friends list Get a Link to this Reply
TwuistdWife,

If you plan on staying in this hobby you might want to get a new scale that goes down to 0.001 grams. Also,do not forget the mint tolerance of +/- .13 grams on older cents and +/- .10 grams on newer cents.
John1
( I'm no pro, it's just my humble opinion )
Searched 6.5 +/- Million Cents Since 1971
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 Posted 06/09/2023  09:08 am  Show Profile   Bookmark this reply Add Coinfrog to your friends list Get a Link to this Reply


to the CCF!
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 Posted 06/10/2023  6:46 pm  Show Profile   Bookmark this reply Add Cujohn to your friends list Get a Link to this Reply
to the CCF and
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 Posted 06/10/2023  6:59 pm  Show Profile   Bookmark this reply Add Hondo Boguss to your friends list Get a Link to this Reply
John, how much more information do we get by weighing to the milligram? It seems that 2 decimal places is more than adequate, considering that mint tolerances were often quite loose (130 mg / 100 mg for your examples of Lincoln cents).
Inordinately fascinated by bits of metal with strange markings and figures
Edited by Hondo Boguss
06/10/2023 7:05 pm
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 Posted 06/10/2023  7:08 pm  Show Profile   Bookmark this reply Add John1 to your friends list Get a Link to this Reply
The more accurate the better.There isn't much of a price difference either and it will last you a lifetime. Mint tolerance is +/- .13 grams for older cents and .10 for newer ones. Also a more accurate scale comes in handy when weighing 1943 cents and missing clad layer coins.
John1
( I'm no pro, it's just my humble opinion )
Searched 6.5 +/- Million Cents Since 1971
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 Posted 06/10/2023  7:17 pm  Show Profile   Bookmark this reply Add datadragon to your friends list Get a Link to this Reply
They arent much cost either, this one for example is around $15 and comes with the calibration weight. https://www.amazon.com/gp/product/B07HGWFBTV
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