Some of Don's QSLs over the years
In 1922, Don was issued 9ZT after passing the higher amateur theory and CW requirement. Stations with a Z prefix had special privileges.9ZT 1924 card
Some others:Don's 1933 QSL
One of Don's many cards from the 1980's
Don used the /A suffix to indicate he was operating from his home in Long Beach rather than the rhombic farm in Rolling Hills W6AM/A
This one is from the 1980's.
Here's one of Don's FO0DCW cards from 1984 (courtesy AK5X).