Anyone know offhand what type this connector is? I'm sure I've seen this type of thing somewhere before but can't figure out what it is.

Update: found! https://hachyderm.io/@RealGene/116358761857241642

Fibre Channel D-Sub Connectors | Smiths Interconnect

Utilizing a multi-finger ground spring fixed around the shell to provide a multi-point contact engagement that affords superior EMI shielding.

@RealGene aaaa that's it thank you so much! It even says they're available in 4x quadrax so that's the one. How did you ever find that?
@adorfer Such a pretty connector, thanks for sharing that :)