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Guess the Silver Content - 1839 Proof Britannia Groat (Fourpence)- Sorry No Prizes!


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On a slightly more serious note, NGC / PCGS could offer an XRF analysis option when grading coins.  It would of course be the easiest way to gain a large population of data and would not doubt throw up some surprises.  
 

Best

Dicker
 

Not my circus, not my monkeys

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1 hour ago, LawrenceChard said:

So, as the natives are getting restless:

1839SilverProofBritishPre-decimalVictoriaBritanniaGroatPoundSterling4penceCoinCollectableUnitedKingdomaEFtesteranalysiscrop.thumb.jpg.7e185a9e5fa1f26473e543e33bd6873a.jpg

Ag - Silver 999

Nobody got it right.

@James32 even said: "Reason being...its neither .999 .925 .958 and .900 is usually a gold percentage ( or American silver ) that's as far as I got really"

BTW, 9.216 cts weight = 1.8432 grams.

😎

Could you share so insight as to why you think this occurred oh glorious seer of the shiniest realm?

I thought Sterling silver was a standard adhered to purposefully by the Royal Mint, is this a deliberate pure silver issue or were the Mint in fact laissez-faire with their process in the 19th century?

Thanks for everything (except encouraging the suspender pictures from this lot 🙃).

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15 minutes ago, Arganto said:

Could you share so insight as to why you think this occurred oh glorious seer of the shiniest realm?

I thought Sterling silver was a standard adhered to purposefully by the Royal Mint, is this a deliberate pure silver issue or were the Mint in fact laissez-faire with their process in the 19th century?

Thanks for everything (except encouraging the suspender pictures from this lot 🙃).

I really don't know.

There is a possibility that the blanks were pickled before striking, to remove any copper at the surface, and this fooling the Niton. Perhaps this is the time to go old-fashioned and revise how to do a specific gravity test.

Or perhaps I could see if a Sigma can tell us anything.

Until I learn more, it will remain a puzzle.

😎

Chards

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10 minutes ago, LawrenceChard said:

I really don't know.

There is a possibility that the blanks were pickled before striking, to remove any copper at the surface, and this fooling the Niton. Perhaps this is the time to go old-fashioned and revise how to do a specific gravity test.

Or perhaps I could see if a Sigma can tell us anything.

Until I learn more, it will remain a puzzle.

😎

You could always do a sceance with the Wyons and see if they would be willing to enlighten us. Granted it would be going a little above and certainly beyond...

Cue: Eerie music.

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Interesting.

There are two types of 1839 proof groats - see attached link to London Coins sales results - including the plain edge, coin alignment (inverted axis) type.  But no mention of the silver content, since they are unlikely to have tested them.

https://www.londoncoins.co.uk/?page=Pastresults&searchterm=Groat+1839+Proof&category=9&searchtype=1

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