I bought a Vacumatic from someone on Ebay because the nib was too tempting to miss. It's a nice pen, and seems to be working, which is a surprise. I assumed it was unrestored, but it's also well polished (too well - the barrel markings are no longer visible). But both striped jewels are present, so I'm happy
I think it's an oblique nib - happy to be corrected on this if it's not!
Parker Vacumatic nib - oblique? by Robin Inkysloth, on Flickr
Parker Vacumatic slender lockdown, grey by Robin Inkysloth, on Flickr