Apple Extended Keyboard II
The Apple Extended Keyboard II was introduced on the 15th of October, 1990 and replaced the earlier version of the Extended Keyboard.
It uses Alps mechanical switches on all keys, including power and offers a physically locking caps lock key.
On the 14th of March 1994 the keyboard was discontinued
A selection of Apple Extended Keyboard II's do not use Alps switches, but instead use Mitsumi switches. I have not removed a keycap to verify if this item uses Alps or Mitsumi switches.