1906 Olympics 3l violet imperf. proof on carton paper in sheetlet of nine, printed later as a sample of Perkins Bacon’s work, with hs H2007, a few tone spots, fine & rare (Image)

1906 Olympics 10l brown, imperf. proof on carton paper in sheetlet of nine, printed later as a sample of Perkins Bacon’s work, with hs H2008, a few toned spots, fine & rare. (Image)

1906 Olympics 25l brown imperf. proof on carton paper in sheetlet of six, printed later as a sample of Perkins Bacon’s work, with hs H2011, a few tone spots, fine & rare (Image)

1906 Olympics 50l green imperf. proof on carton paper in sheetlet of six, printed later as a sample of Perkins Bacon’s work, with hs H2012, a few tone spots, fine & rare (Image)

1906 Olympics 5D rose imperf. proof on carton paper in sheetlet of six, printed later as a sample of Perkins Bacon’s work, with hs H2014, a few tone spots, fine & rare (Image)