SEYMOUR, George H.

STAMPS

1870
United States, Definitives, frame of 6c

1875
United States, Frame and lettering of 2c to 96c Newspaper stamps (2)

1881
United States, Definitives, frame of 6c

1887
United States, 1c definitive, lettering and frame only

1893
United States, Columbian exposition, lettering and frames of 3c, 4c, 6c, 30c, $1 and $4

1895
Peru, President Nicolas de Pierola, frame and lettering of 1c to 10c

1897
Peru, New postal building, frame and lettering of 1c and 5c

1901
Chile, Definitives, frame and lettering (1)

1905
Chile, Definitives, frame of 1c to 5c, numeral of 3c and lettering on 1c to 5c (except 'centavo' on 1c), frame and lettering of 1p
Peru, Definitive, frame and lettering

1909
Panama, Definitives, 2c frame and lettering

1910
Chile, Centenary of independence, lettering and frames

1911
Chile, Definitives, frame and lettering on 1c, 2c, 3c, 5c, 10c, 12c, 15c, 20c, 30c and 50c (1)

1912
Chile, Definitives, frame and lettering on 2c, 3c, 8c, 10c and 40c (1)

1915
Panama, Panama exhibition, 20c frame

Notes:
1) Stampcommunity website, Collecting by engraver
2) The United States Philatelist, December 1967

You will find George H. Seymour's biography HERE.