I have a Jupiter 9 from 1964. It is a M39 - SLR.
Not all M39 lenses will work with a SLR - but this one converts to M42 and focuses to infinity on a Canon EOS body. This is an old preset 85mm f2 lens and the lens works. I must say the chrome lens is fun to use, but I have not noticed any extra comments from non photographers when mounted on my camera.
Old Takumars or
Nikkors from the 1960's also have a unique look.
There are also chrome nose lenses from the 1960's. I think
Vivitar made some and I have a Mamiya 135 2.8 M42 Chrome Nose. 135's are inexpensive.
This is a photo taken with the Jupiter a few weeks ago.