The Triumph 81 is an Anita 811 in disguise. The Triumph 81, also branded as the Adler 81, was made for the German company Triumph-Adler, and re-designed to fit their colour scheme. The white logo above the display has a tendency to rub off on these calculators and can be almost completely black in some examples. The logo is also on the top end above the power adaptor socket, and has indeed nearly gone on this calculator. This particular unit has an internal data stamp of 6th Feb 1974.
A manual for the Adler 81 (which is the same calculator) has been scanned in and can be found on the manuals page.
Switch on the image---it works!
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