Casio IA-1000 727 Flip Top Data Bank Advertisement

When the lid is closed, this watch looks like most other analog watches  with hour, minute and second hands. When you flip open the lid, however, you have the Casio Data Bank watch. 

The Data Bank stores 50 telephones numbers. Each page consists of a maximum of eight letters and 12 numbers. There's also a schedule memo of eight letters per page and a free memo of six pages with 15 letters.

The free memo mode is for writing short notes to yourself. Also included is a calculator and five daily alarms.