ANITA 811, ADLER 81 (Type EC11) & Triumph 81
Display: 8 digits, red LED.
Functions: 4 functions, %, memory.
Batteries: 4.5v (3x AA cells).
Integrated circuit: Rockwell A1030PE, in this example date coded week 48 1974.
Size: 69 mm x 118 mm x 24 mm (2.8" x 4.7" x 1").
Anita 811 label:
Sumlock Comptometer Ltd,
Made in England.
Introduced 1972, price £75 [about $175].
The switch position "5/4" on the Adler is the same as that marked with a semi-circle on the Anita, and indicates that the answer will be rounded to 2 decimal places.
There is an operating manual for this machine in the Operating Manuals & Leaflets section.
This was the first Anita hand-held calculator put on sale. The story of the development of the Anita 811 and the version for Triumph-Adler is described in "The Rockwell Connection" on this site.
The picture on the left demonstrates how the rear aluminium cover slides up to replace the batteries in the back, which is common to all models of this series.
Note that the model illustrated here is a variety with a white painted rear cover.