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+Xah Lee I saved this from a trash bin following a recent data center move. It's an IBM Model M 1985, type 3192-G. Note the 3270 PF keys and other non-standard 101 keys. It probably weighs 20 lbs and is about 2 linear feet. The key presses make a nice solid 'clack'! :D
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Sure, you can use it. And yes, just had my 1 year work anniversary :)
This keyboard is actually one of the few that you won't see a control key on. It was made for use with a 3270 terminal connected to a Mainframe where there was no use for a control key. Even now, I never use the control key while traversing through the 3270 terminal, I only find myself using it during tasks that are outside the terminal. I think this is mostly because there are programmable single keys that do the same as key combos with control pressed.

The extra keys are related to different shortcut macros that are used in the Mainframe. Meaning, there were 24 different functions to use. That extra PF20 on the side is because the PF20 key is the scroll down key, which was used a lot because that's literally the only way you can move around in files on a Mainframe. The PA keys are for different Program Access functions. PA1 is the attention key which is like hitting ctrl+C to halt a function. PA2 is used to reshow a screen. So, if you accidentally hit the clear key before you were done viewing something, you can hit PA2 and reshow it.

Source: Vance gave me one of the other keyboards he saved. 
Xah Lee
+Brett Dawson super cool. Can i put your info on my page, link back to you, of course.
Yes many strange keys! There isn't a control key because there just isn't.. It didn't exist in the original 3270 keyset. It is funny to me because most oldhand mainframers still today will map enter to the right control key... I cannot abide it myself. I map left alt + keys for the special keys that are missing on normal keyboards. Like alt+c to clear. I use a Linux 3270 emulator called x3270.

Here's a list of the default keymaps used in Personal Communicator (another 3270 emulator).
+Xah Lee also, the PA1-3 keys have different functionality depending on the environment. I have only used PA1 in TSO to send an interrupt.
No clue on ExSel, and I think the extra PF20 might have been stolen from another keyboard!
+Vance Morris Yeah, PF19 is up and 20 is down. From what Haiduk has told me, that entire left side was usually made up of custom keys that programmers put there for specific tasks. So, the original person of your keyboard may have really needed PF20 for scrolling the page down.

+Xah Lee go ahead with that, I'm totally okay with it. 
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