Vectorscope
Less than 1 minute
Lectrotech Vectorscope Model V-7
I acquired the Lectrotech Vectorscope Model V-7 from a professional who used to repair CRTs in the 70s and 80s. My aim was to test it with RF-based CRTs and see if I could find any practical use for it. Unfortunately, I didn't have the time to fully restore or experiment with it, so I ended up selling it to Mr. Brown. He's committed to fixing it and creating a video about it, and I'll share my photos along with a link to his video once it's ready.
Pictures
Vectorscope collecting dust on my shelf. 
Used a dim bulb tester to bring this up. Always a good idea with vintage electronics 
Service manuals 
Film capacitor (Mr. Brown called it the paper capacitor) that seemed open 