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.