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Germany

postage

1957, Feb 22 Heinrich Hertz 100th issue wmk. DBP & rosettes p. 14

X

10

graygrn & blk

Heinrich Hertz

1994, Jan 13 Heinrich Hertz death 100th issue unwmk p. 13x12.5

X

200

multi

Heinrich Hertz

Grenada

2013, Oct 10 World Radio Day 2013 issue - Pioneers of Radio wmk. St Edwards crown & CA (no perf info)

-

$3.50

multi

Heinrich Hertz

1 to 3 of 3