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<p>[QUOTE=&quot;PaddyB, post: 1772028, member: 40017&quot;]The most striking example of this occurs with the Tin Farthings and Halfpennies issued in Britain in the 1680s and 1690s. They soon discovered that left as pure Tin they corroded very quickly, but with a Copper plug in the centre, the electrolytic effect made them last a lot longer.</p><p>They are still very scarce as they also disintegrate in extreme cold, so the main source of good examples now is underwater.</p><p>Oh and by the way, I had a similar hoard to the above (without the Silver) until recently. I sold it en masse to a friend who is handing it over to his Grandson in a Treasure Chest![/QUOTE]</p><p><br /></p>

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