Note
QST, Nov 1933, p. 83.
QST, Jun 1945, p. 95. (ad says D-104 introduced in 1933)
QST, Nov 1965, p. 159.
QST, May 1972, p. 147.
QST, Jul 1975, p. 157.
QST, Oct 1975, p. 157. (golden eagle model)
QST, Jun 1976, p. 139. (silver eagle model. Interesting in that it shows the mic being used with CB equipment)
QST, Oct 1977, p. 120.