I'm really happy to welcome another new member to my measurement team. It's an HP 3561A dynamic signal analyzer.
Again, the unit itself is in great condition and function properly. The only defect is one key not being responsive which I think is pretty easy to fix.
The 3561A could accept a signal up to 100kHz and perform usual FFT, gain-phase plot, noise density measurement and a lot more.
Time to read the 200+ page manual now. :-)