stilton:
Looks like an old -100 Cockpit.
Indeed is was.
There was a list of speed / altitude restrictions to comply with if you had both yaw dampers inop.
They were different depending on whether you were in a -100 or -200 (the -100 was less restrictive)
If you descended to 25000 feet you could operate up to 350 kias in a -200.
Which means the -200 was less restrictive.