Tamaya

The Tamaya NC-2 is a calculator for sailors, and its specialty is navigation. It deals with courses and coordinates, durations and distances.

It's a lovely machine in a nice hardwood case - where you'd keep it to protect it from the elements on shipboard. The case even bears a hole at the connector for an external power supply, so you can keep it powered all the time.

I sold this, with the instructions and box, in early 2013 for $130.