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What does it mean by "100 mills"?

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#1 Davourak

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Posted 08 June 2012 - 07:24 PM

Hello, I am new to coin collecting. I have seen some coins advertised along the lines of "24k gold 100 mills". What does the 100 mills refer to? I tried searching online and found nothing (I guess the word mills is too generic).

#2 ccg

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Posted 08 June 2012 - 11:55 PM

They're gold plated - the reference is to the thickness of the plating. Generally speaking, most items advertised as such are generally items that I would suggest be bought only if you appreciate them artistically, as collectibility and resale value is generally very limited.

#3 Davourak

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Posted 09 June 2012 - 09:17 AM

But what does the "mills" refer to? Sounds like millimetres but obviously not. Maybe micrometres?

#4 ccg

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Posted 10 June 2012 - 01:08 AM

It's an undefined term. Some believe it to be millionths of an inch, but I've yet to see anything that provides a definition.

#5 thedeadpoint

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Posted 11 June 2012 - 01:06 AM

Huh. Tried figuring it out, too, with no luck!

#6 Davourak

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Posted 12 June 2012 - 03:15 PM

I also thought that maybe it means how many times the gold has been milled to make it into gold leaf to use for coating the coin? Or maybe 100 layers of gold leaf? Some are listed as 100 mills, some as 500 mills.

#7 ccg

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Posted 12 June 2012 - 08:07 PM

Plating is done chemically and doesn't involve gold leaf, which would be gilding.

Regardless, as an undefined term, "100 mills" to one manufacturer or retailer may not be the same as "100 mills" to another. I can only repeat my previous advice to ignore gold content (since any would be very limited in value, perhaps several pence) and simply buy an item if you will enjoy it.

#8 doug2222usa

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Posted 14 June 2012 - 02:24 AM

It's mils, M-I-L-S. A mil is 0.001 inch. So 100 mils is about one-tenth of an inch, which, in turn, sounds way too high for gold plating. See "mil" in Wikipedia.

#9 ccg

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Posted 14 June 2012 - 06:34 AM

It's mils, M-I-L-S. A mil is 0.001 inch. So 100 mils is about one-tenth of an inch, which, in turn, sounds way too high for gold plating. See "mil" in Wikipedia.


I understand that yes, "mil" is a unit of thickness as well as a general term for 1/1000 (occasionally seen in currency, if if I remember correctly, in Canada is monetarily defined as $0.001), but the question here is "mills" M-I-L-L-S, as seen on a lot of private mint products.




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