PONICKAU, Robert

STAMPS BY YEAR

1898
United States, Trans-Mississippi exposition, vignette of 8c

1901
United States, Pan-American exposition, frames on all values

1902
United States, Series 1902 definitives, frames of all values except 1c and 13c
United States, Special delivery, vignette only

1903
United States, Definitive, frame only 

1904
United States, St Louis International Exposition, frames of 2c to 10c values

1907
United States, Jamestown exposition, vignette of 2c and all frames

1908
United States, Definitives, frames of all values

1909
United States, Abraham Lincoln centenary, frame only
United States, Alaska-Yukon Pacific exposition, frame only
United States, Hudson-Fulton Celebration, frame only

1911
United States, Registration stamp, vignette only

1912
United States, Definitives, lettering on 11c

1938
United States, Airmail, vignette only

STAMP-RELATED ITEMS

1898

United States, Inter Revenue Documentary stamp, vignette (1)

Notes:
(1) Stampcommunity website, Collecting by engraver