Excellent post, PimentoUK.  I will make one small correction -- our USA 5 cent 'nickels' are 75% Cu.  I think that drives home your point even more.  As a sidelight, during WWII they changed the comp to 56% Cu, 35% Ag, 9% Mn (= manganese).  It's no coincidence that these Warnicks, when not adversely affected by leaching, give the same (or very close) dTID (at least on my ML Equinox) as the standard composition.  There was an intense(?) study done to match both the conductivity and density becaus
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