Re 上市 Deposited
[Colonial Numismatics] RR40
- From mhodder@theworld.com Mon Oct 07 13:59:00 2002
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Date: Mon, 07 Oct 2002 20:58:56 -0000
To: colonial-coins@yahoogroups.com
Subject: Re: [Colonial Numismatics] RR40
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From: "mike468hodder" <mhodder@theworld.com>
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Seems like a lot of work for a small reward, to me, using SG to help
decide if a copper is a cast or not. How would one distinguish a
cast from a struck counterfeit if the SG's on each deviated from the
norm?
Mike H
--- In colonial-coins@y..., PLMossman@a... wrote:
> > My point is that sp.g. will not identify composition, it will
just tell you
> > if a supposed copper coin deviates from the norm of pure copper,
thus
> > raising your level of suspicion that it is of a mixed metal cast
> > composition - in this instance a cast fake. Only if it is off
will it be
> > helpful. All my William III cast planchet coppers have a normal
specific
> > gravity suggesting that in the striking process, minute air/gas
pockets
> > were eliminated.
> > - 2002-10-07
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