Author Topic: Louis XV Double Sol 1742 H, La Rochelle  (Read 2581 times)

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Offline redwine

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Louis XV Double Sol 1742 H, La Rochelle
« on: October 17, 2011, 05:55:06 PM »
I thought I had this one sorted ??
Coin aligned 22.5mm 1.78g
Like the one below but the weight is wrong ??

France
Louis XV Double Sol 1742 H, La Rochelle
G.R. 281, KM# 500.9 - AgCu, 2,24 g
http://www.mcsearch.info/record.html?id=261500

Obverse : .LUD. XV. D. G. FR. ET NAV. REX
Reverse : 1742 .SIT NOM. DOM. H BENEDICTUM
« Last Edit: March 10, 2012, 10:21:27 PM by coffeetime »
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Offline Figleaf

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Re: Louis XV Double Sol 1742 H, La Rochelle
« Reply #1 on: October 23, 2011, 02:20:03 PM »
Not quite sure what your question/remark is. The double sol of this type is 0.2500 silver, official weight 2.184 grams, official diameter 22 mm. A weight of 2.24 grams is acceptable. A weight difference of 0.056 grams amounts to a difference of around 2.5%, probably within the remedy. A large silver coin with that weight difference should not have survived very long in circulation, but on a small billon coin it amounts to "not worth the bother" for the clipper or smelter.

For the sake of completeness, official specifications for the single sol of this type are 0.2500 silver, 1.092 grams, 18 mm.

Peter
An unidentified coin is a piece of metal. An identified coin is a piece of history.

Offline redwine

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Re: Louis XV Double Sol 1742 H, La Rochelle
« Reply #2 on: October 23, 2011, 02:31:53 PM »
Mine weighs 1.78g, well below the official weight.
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Offline Figleaf

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Re: Louis XV Double Sol 1742 H, La Rochelle
« Reply #3 on: October 23, 2011, 02:57:41 PM »
OK. That's a difference of about 0.4 grams, or about 18.5%. Two possibilities:

- contemporary fake. Not very likely, because the value is too small.
- copper leakage.

Copper leakage occurs on all copper coins, but somehow, it hits low silver content coins hardest. A coin that is buried in soil for a few centuries will see its copper solved. The most common causes are artificial fertilizer and ground water containing artificial fertilizer as well as acidic rain. Through a process I don't understand, the coin keeps its original sharpness; the design is not affected by slimming.

Since this coin is only 25% silver, it could theoretically lose 75% of its weight, though by that time, it would be so brittle it would fall apart when touched. A weight loss of 18.5% is quite reasonable.

Peter
An unidentified coin is a piece of metal. An identified coin is a piece of history.

Offline redwine

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Re: Louis XV Double Sol 1742 H, La Rochelle
« Reply #4 on: October 23, 2011, 03:19:07 PM »
Very interesting!
When I saw the patina, I thought, that looks like it's been in a fire.  Either explanation is fine by me.
Case solved, thank you Holmes 8)
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