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<p>[QUOTE=&quot;KBBPLL, post: 8357680, member: 104064&quot;]I&#039;ve seen the &quot;pre-1900&quot; thing on other images of Sigma results and am curious if anyone has an explanation. Canada switched from .925 silver to .80 in 1920 - what does it read on those?? I&#039;m not aware of any country switching silver content at exactly 1900.</p><p><br /></p><p>Edit: OK, I answered my own question. You select what to test for. This is from their user guide. </p><p><br /></p><p>&quot;5. Select the alloy using the left and right arrow keys.</p><p>a. Gold- lists the following alloys: Pure .999+, 91.7% 22K bal Cu,</p><p>90% bal Cu, American Eagle, Krugerrand, and 98.6%.</p><p>b. Silver- lists the following alloys: 99.99% Pure, 99.9% Pure,</p><p>92.5% Sterling, 90%US pre 1900, 90%US pre 1945, 90%</p><p>Coin 1960, 96% Britannia, and 80% Canadian.</p><p>c. Other- lists the following: Platinum, Palladium, Rhodium,</p><p>Copper, and Calibrator.</p><p>d. Bullion- lists the following: Silver .9999, Gold .9999,</p><p>Platinum, and Palladium.&quot;</p><p><br /></p><p>In the notes section, it says</p><p><br /></p><p>&quot;Morgan and Trade dollars should be measured on the Silver-90%US pre1900</p><p>range. Peace dollars and walking Liberty half dollars should be measured on the Silver-90%US pre1945 range.&quot;[/QUOTE]</p><p><br /></p>

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