DATABASE: Douglas Stewart Ronaldson

STAMPS

1869
United States, Definitives, lettering on 10c and 30c, frames of 10c, 15c, 24c, 30c and 90c

1870
United States, Definitives, Lettering on all but the 1c, frames of 2c, 3c, 7c, 24c and 90c

1873
United States, Post office official stamps 10c, lettering only

1875
United States, 5c definitive, lettering and frame only

1878
Chile, Definitives, frames of 10c, 15, 20c, 25c and 1p (2)

1879
United States, Postage dues, lettering only

1883
United States, Definitives, lettering and frames only

1885
United States, Special delivery, lettering only

1888
United States, Special delivery, lettering only

1890
United States, Definitives, lettering and frames only

1893
United States, Columbian exposition, lettering and frames of 1c, 2c, 5c, 8c, 10c, 15c, 50c, $2, $3 and $5 

1894
United States, Special delivery, lettering only

1898
United States, Trans-Mississippi exposition, lettering and frames of all values

OTHER PHILATELIC ITEMS

1898

United States, Inter Revenue Documentary stamp, frame and lettering (1)

Notes:
1) Stampcommunity website, Collecting by engraver
2) Sociedadfilatelica website

You will find Douglas Stewart Ronaldson's biography HERE.