SGC dates a 150 backside 1909, 350 gets 1910 and 460 gets 1911 (like your Schlei). Any of the "Large series", etc get a 1909-1911 (like your Hindu). This isn't exactly accurate and you might want to read Scot Reader's work to get a better idea.
edited to add: 3 in a row, it must be right!
Last edited by srs1a; 05-14-2010 at 05:07 PM.
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