DATABASE: Charles Skinner

STAMPS

1875
United States, 5c definitive, vignette only
United States, Newspaper stamps, vignettes of 2c to 96c, $3, $9 and $60 (2)

1882
United States, 5c definitive, vignette only 

1885
United States, Special delivery, vignette only

1888 
United States, Special delivery, vignette only

1890
United States, Definitives, vignettes of 2c, 3c, 5c, 6c, 8c, 10c and 15c

1893

United States, Columbian exposition, vignettes of 1c, 2c, 4c, 5c, 8c, 15c, 50c, $2 and $5
Venezuela, Columbian exposition, vignette only (1)

1894
United States, Definitives, vignette of 6c
United States, Special delivery, vignette only

1895
Peru, President Nicolas de Pierola, vignette of 1c to 10c

1897
Canada, Definitives
Newfoundland, Discovery of Newfoundland 1c

1898
Canada, Definitives
Canada, Imperial penny postage

1901
Chile, Portrait on 50c definitive (1)

1903
Canada, Definitives, JAC Harrison's head worked over
Honduras, Definitives, vignette

1905
Chile, Definitives, vignette of 10c to 50c

1908
Canada, Quebec 7c and 10c

1909
Panama, Definitives, 2c vignette

1910
Chile, Centenary of Independence, vignettes of 2c, 12c and 50c

OTHER PHILATELIC ENGRAVINGS

1870
United States, Unadopted essays of a 3c Washington definitive and a 3c Liberty definitive (4)

NON-PHILATELIC ENGRAVINGS

1887
Uruguay, Columbus portrait on 100 pesos banknote (1)

1894
Ecuador, Portrait of Roca (with Sukeichi Oyama) on $5 banknote PS127 (3)

Notes:
1) stampcommunity.org website
2) The United States Philatelist, December 1967
3) IBNS journal, Vol 40, No 2, 2001
4) Siegel auction catalogue 17-11-2015

You will find Charles Skinner's biography HERE.