Australia: 1917-1988.
Canberra - slogan date stamps.

Four Telegram/Telegraph slogans were used at Canberra from 13 April 1934 to 28 July 1971. They were:

  1. SEND A TELEGRAM;
  2. 100 YEARS OF TELEGRAPH SERVICE;
  3. OVERLAND TELEGRAPH CENTENARY;
  4. A TELEGRAPHIC CODE ...

All had a circular date stamps.

The Territory name changed from Federal Capital Territory (F.C.T.) to Australian Capital Territory (A.C.T.) in 1938. This change did not however affect the slogans until the 100 YEARS ... was released in 1954 with A.C.T. AUST. at the base.

Postcodes were introduced throughout Australia in 1967. Hence dies for slogans made after that date incorporated the postcode.

SEND A TELEGRAM.

Datestamp: Circle (diameter: 21 mm).

Base inscription: F.C.T. AUS.

Characteristics: Die 5A: A spans GR.

Earliest date of this format: 
30 April 1934 (see Occleshaw).

Latest date recorded: 19 April 1937.

Number in the Census: 4.

 Canb19379 June 1936.
100 YEARS ....

Datestamp: Circle (diameter: 21 mm).

Base inscription: A.C.T. AUST.

Characteristics:
Die 1: normal spacing and the 1 (of 100) is above the space between TE (of TELEGRAPH).

Only recorded date of this format: 
13 May 1954.

Number in the Census: 1.

 100 years13 May 1954.
OVERLAND TELEGRAPH CENTENARY...

Datestamp: Circle
(diameter: 21 mm).

Base inscription: A.C.T. 2600.

Earliest date of this format: 
22 August 1972 (see Occleshaw).

Latest date recorded:
30 August 1972.

Number in the Census: 2.

 Overland30 August 1972.
A TELEGRAPHIC CODE ....

Datestamp: Circle
(diameter: 21 mm).

Base inscription: A.C.T. 2600.

Only recorded date of this format: 
28 July 1971.

Number in the Census: 1.

 Teleg code
28 July 1971.