That's certainly looks to me like the AAZ version of the Eco pump, found on early Canadian Passats, among others.
* 8mm plunger rather than the usual 9mm
* LDA is completely gone... there are no guts under the flat cap, and some machining is missing. Would need to put an entire AAZ LDA lid on to retrofit.
* fast-idle (the second throttle lever I believe you're referring to) is vacuum controlled using a vacuum pot that seems to have been stripped from the pump you have. Fully configured it looks like this:

Vacuum applied to the black pot on the upper left of the picture actuates the fast idle lever.
HTH.