Cheaply built generic calculator from late 1976-77 period.  The basic case and structure is the same but it was customised with aluminium panels, different chip-sets, boards and displays.  Lesson on how to cut costs.  The board has an ETCO reference and they were all made in Singapore. Click on the above images to see more detail on each one.

1. Make the main board double sided so that the keyboard circuitry is on the same board as the cpu - and surface-mount a standard IC to copy with this by bending the pins at right angles.
2. Dispense with the battery connector and use two bits of metal instead
3. Don't bother with screws, seal the case with internal lugs only and fix the board with melted posts - labour is cheap, components are not
4. Put no extra components in at all (successful with only the one Adman model).
5. Make the on/off switch assembly an integral part of the circuitry on the board.