TYPE   R    or   TYPE   S ??

by David Marasco

Some time ago I had a lot of several thousand precancelled one cent small queen of various types and while sorting them picked out a series of examples of types R and S which show the continuum between the two types. I have seen two blocks of 6 offered for sale in the last 20 years, one of which was recently sold in the Lussey sale, which clearly show that types R and S were produced by the same roller. 
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So the question arises: Are types R and S really sub varieties of one type or two different types? 
The following 12 samples show the gradual variation between the central waves of types R and S. Where do you draw the line?

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