interesting Phil (and Adam).
I know the TPGs show the W560 as being issued in 1927 and we have seen evidence on this website that the date of issue for that set is more likely from 1928-29, but how did you determine that the W560 set is definitively a 1929 issue?
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http://imageevent.com/derekgranger
HOF "Earliest" Collection (Ideal - Indiv): 244/342 (71.4%)
1914 T330-2 Piedmont Art Stamps......: 114/119 (95.8%)
1923 V100 Willard's Chocolate............: 177/180 (98.3%)
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