Tim,
if print timing is your polestar I don't see how it supports your print group breakdown. Yes you can say that the 150-onlys and 150/350s were both printed between July 1909 and February 1910 so what difference does it make but my response would be that the 150-onlys were printed from July 1909 to November 1909 whereas the 150/350s were printed between July 1909 and February 1910 so it makes all the difference in the world. (Dates are approximate). The same logic applies for the SLers--while there is overlap in print timing there is not identity. Thanks for the discussion. Need to sign off.
Scot
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