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A first look at it might give the impression that this is a simple plain calculator with only basic functionality but of course it isn’t.
Very similar to the Aristo M 75 but with an added key for exponents ( EE, at the expense of the M− function). When a result is displayed with an exponent only 5 digits remain for the number part. To display the extra 3 digits not shown the AW function can be used.
The calculator uses a non standard way to show the 6 and the 9 with only 5 segments instead of the usual 6. A single dot at the left of the display is used to indicate a non-zero value in the calculator’s memory. Funny enough the picture on the front of the manual shows the regular 6 and 9 symbols.
There is no battery compartment visible at the back of this beauty. Instead there is a little notch at the bottom to enable lifting the calculator out of its back cover. There you can insert or replace the two AA batteries. Contrary to what one would expect, both batteries face the same way. Everything of this calculator seems to be designed with aesthetics in mind.
There is also storage for one spare AA battery. At frist I had no idea why, for one should always change all batteries when they are flat. That is until I found the Aristo M 85 S scientific calculator with the same form factor but is powered by three AA batteries!
A brief manual of the calculator’s functions is printed on the back.
The calculator accepts Alcaline batteries but also NiCd batteries. Aristo sold their own NiCd batteries under number Aristo 6773. The NiCd batteries can be charged using the Aristo 6773 battery charger.
According to an X-Number World article I once read (no longer linkable), the German brand Aristo only entered the calculator market in 1972 and left it due to heavy competition in 1978.