Imperial German Navy Code Books
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Signalbuch der Kaiserlichen Marine
Introduced in 1913.
Copy 151 ended up in British hands.
Physical Dimensions
12 inches × 15 inches × 6 inches deep. Bound in blue leather.
Handelsschiffsverkehrsbuch
Verkehrsbuch
A five-numeral code (e.g. Kaiser=46786)
Allgemainefunksprachbuch
"General Radio Message Book". Introduced 1 May, 1917.
Flottenfunksprachbuch
Introduced Summer, 1917.
