I'd been meaning to pic one of these typewriters up for a while (as I didn't have this Marquardt switch variant yet), Marquardt two-finger typewriter switch (as mentioned in the wiki).
They are decent linears I guess, but nothing amazing. I still get a kick out of the Enter key stabilizer though
Thanks to share the photos of this switch including the full body.
I brought the Olympia teleprinter keyboard with the same switch last week and mentioned mine was the another model. Still find which model really it was.