State: Germany, Weimar Republic
Issuer: Hamburg (Hamburger Hochbahn A.G.)
Location of issue: Hamburg (town)
Date of issue: 1920 AD.,
Value: 20 Pfennig
Size: 25 x 25 mm
Material: cardboard
Watermark: -
Serial : -
Serial no. : -
Signature: - (0)
Printer:
Obv.: 20 - 20 / HOCH - BAHN / 20 / HAM – BURG / 20 - 20 , swan swimming left, wreath around.
Rev.: HHA -monogram in a circle (or HAHO – monogram?).
References: Tieste 2765.155.01 .
Hamburger Hochbahn AG (HHA), founded in 1911, operates the underground system and large parts of the bus system in Hamburg, Germany.
The HHA was founded by Siemens & Halske and AEG as a consortium on 27 May 1911. The first chairman was Albert Ballin.
From 1919 until 1978, the HHA operated a large tram network, and from 5 December 1921 the HHA also operated the first motor buses in Hamburg. After the acquisition of the Straßen-Eisenbahn-Gesellschaft (SEG) in 1919 and the Hamburg-Altonaer-Centralbahngesellschaft AG in 1923, the HHA had a rolling stock of 865 power cars and 930 trailers by 1928.
More on https://en.wikipedia.org/wiki/Hamburger_Hochbahn