Brand: CASIO
Model: FC-100
Type: Financial calculator
Picture: CASIO FC-100
Batteries: CR2032 x 1
Lifetime: Introduced: ca. 1987
Terminated: unknown
Notes: The CASIO FC-100 is a 10-digit financial calculator ("Consultant" actually) with constant memory, statistical functions and logarithms in a sleek and light housing.

Fun fact, the calculator is quite fast, meaning that it apparently wasn't necessary to implement parameter checking on the factorial operator. Entering a number above 69 and pressing "!" will, after a slight delay approximately as long as it takes to calculate the factorial of 69, to produce an error message.

As with all the other financial calculators, Please don't ask me how this one works. Ask your accountant :‑)