So it's big and it's metal. Weighs a ton too.
The key mount is...oh, that's interesting.
Now that is a long shaft. Double shot too. O-Ring for some reason, they don't do much (at least not anymore).
Cool. All the switches are secured to the bottom half of the board and that long shaft presses through a hole in the PCB and actuates the switch. The silver switches are lighter than the copper ones.
Close up of the P/N. With some CSI enhancement we can see the date codes range from late '69 (6948) through earlyish '70 (7012).
Here's a pic of a switch in the unpressed position. You can see the small contact on the middle plate that when pressed whacks the top contact. It's a very simple switch and very tactile and clicky.
When you press a key, it pushes that shaft down and pushes up on the right side arm, which pulls the middle up where it whacks the top contact.
