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Rhett YeakleyThiese sets are broken up into two different categories based 1st on the checklists. The Speaker will be #5 in all sets under "W516-1" umbrella, and will be #6 in all sets under W516-2 umbrella. The second thing that determines category is the IFC/IFS symbol and font type used.
W516-1-1 (mistakenly listed as simply W516-1 in 2007 book) and W516-2-3 have IFS/IFC symbol correct.
W516-1-2, W516-2-1, and W516-2-2 have IFC/IFS symbol reversed.
W516-1-1, W516-1-2, and W516-2-2 have hand written font
W516-2-1 and W516-2-3 have serif font.
The Speaker is from W516-1-2 and the Johnson is W516-2-1
-Rhett