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Quality Control Differences Between The Philadelphia And Denver Mints

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Bedrock of the Community
United States
94367 Posts
 Posted 05/31/2021  10:55 am  Show Profile   Bookmark this reply Add Coinfrog to your friends list
How can the term "quality control" even apply to the cents made at either facility?
Pillar of the Community
United States
3658 Posts
 Posted 05/31/2021  3:44 pm  Show Profile   Bookmark this reply Add fortcollins to your friends list
Denver switched coining presses from the vertical multi-head Bliss Press to the horizontal-strike Schuler Press in 2004-2005, depending on denomination. Philadelphia made the switch later (in the 2010s). That was the main reason for most of the early century strike quality differences. Even on the Zincolns, many have noted the beautiful mirror surfaces of the Denver coins of this era (at least until they all turn into piles of Zinc Oxide dust).
Pillar of the Community
United States
1667 Posts
 Posted 06/02/2021  3:21 pm  Show Profile   Bookmark this reply Add Big-Kingdom to your friends list
it's not quality control, I honestly believe it has something to do with the altitude and striking pressures and is out of their control even using the same settings or trying to adjust for it.
Denver: 5,280 ft elevation
Philadelphia: 39 ft elevation

Denver is about 20kPa higher than Philadelphia, 20% or so not much but it's got to do something. it's about 200 bar higher pressure due to elevation difference I think. Something like that.

the press doesn't necessarily explain it, West Point uses the vertical presses still, and the 2019 W quarters were better than the Denver ones and stood out in a roll. but we know West Point is slower and using higher pressure on other setting to do what they do.

You'd think Denver has cleaner air being a mile up but they pollute it nicely by themselves. LOL it's not air quality or a cleaner facility doing it. I think it's the elevation adding extra pressure to the strikes.
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United States
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 Posted 06/02/2021  4:35 pm  Show Profile   Bookmark this reply Add Bump111 to your friends list
Could also be related to the volume of products produced at the individual locations. I think Philly turns out a bit more.
"Nummi rari mira sunt, si sumptus ferre potes." - Christophorus filius Scotiae
Pillar of the Community
United States
1667 Posts
 Posted 06/03/2021  06:07 am  Show Profile   Bookmark this reply Add Big-Kingdom to your friends list
Philly does do a bit more most years but that's not it, both mints outputs are comparable, Denver isn't really going that much slower and sometimes they produce more.

As far as quality control they sample the press bins before dumping it into a bigger bin looking for something so messed up that they would need to scrap the entire run bin, but other than that they aren't striking coins for collectors they are striking coins that are fit for circulation and scratches and stuff just don't matter for that purpose even a weaker strike or a die that's still working but worn down might be used as long as it's fit for commerce still, it passes quality control measures.
New Member
24 Posts
 Posted 06/03/2021  09:26 am  Show Profile   Bookmark this reply Add 44dovers to your friends list
I've always thought that Denver had more of a brilliant finish to the coins. The modern philly coins to me look satiny.
Valued Member
United States
484 Posts
 Posted 06/07/2021  8:43 pm  Show Profile   Bookmark this reply Add My2cent to your friends list
I would have to agree with you 44dovers.
That is the first thing that caught my eye and made me want to ask other people's opinions.
Bedrock of the Community
United States
20753 Posts
 Posted 06/09/2021  06:58 am  Show Profile   Bookmark this reply Add just carl to your friends list
Quality control? Why bother?
Valued Member
United States
484 Posts
 Posted 06/09/2021  12:41 pm  Show Profile   Bookmark this reply Add My2cent to your friends list
Why bother? So we can have these pretty shiny coins to collect in all different varieties.
Can you imagine how horrible getting a coin graded would be if quality control is completely thrown out the window?
Pillar of the Community
United States
743 Posts
 Posted 06/14/2021  09:04 am  Show Profile   Bookmark this reply Add jason39305 to your friends list
I agree. The fresh Denver Mint coins I find are always struck better and the fields are a lot cleaner.
Valued Member
United States
484 Posts
 Posted 06/14/2021  10:26 pm  Show Profile   Bookmark this reply Add My2cent to your friends list
Thank you, Jason39305 that is what I am trying to make people see. Without using such specific words I guess I can't help them understand what I mean.
Edited by My2cent
06/14/2021 10:29 pm
Valued Member
United States
425 Posts
 Posted 06/16/2021  11:12 am  Show Profile   Bookmark this reply Add Erscolo to your friends list
As someone who lives in the Denver metropolitan area, along with more than three million other people, I can assure you we have our share of pollution and such, and right now some very hot weather. I have not been to the mint here in nearly forty years, but I have noticed that the coins I collect are sharper and brighter if they come from Denver versus Philadelphia. But then being at ground zero, 20 miles from the mint, I should expect that.
Valued Member
United States
484 Posts
 Posted 06/20/2021  5:48 pm  Show Profile   Bookmark this reply Add My2cent to your friends list
lucky you! So you can definitely access the cleanest coins available from the Denver mint. Even if you were in Philadelphia you would still I'm sure notice that Denver coins are simply better struck.
Pillar of the Community
United States
2869 Posts
 Posted 06/20/2021  6:22 pm  Show Profile   Bookmark this reply Add Oldfordman to your friends list
I think Denver is better with less bag marks than Philadelphia. Just my opinion.
Valued Member
United States
484 Posts
 Posted 06/20/2021  9:30 pm  Show Profile   Bookmark this reply Add My2cent to your friends list
I would also agree with that. I mean, even if taking into account where you live and how far the Philadelphia coins had to travel it seems like they put them in the bag and throw them around or something rattle them up without care.
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