Does anyone recognize this panel-mount connector?

It's a standard rectangular connector shell with a bank of six, five way inserts such as these:

Frames similar to these take the modules and allow them to fit standard size hoods/shells:


There are several makes which are supposed to be interchangeable (using the built connectors, at least).
eg.

Wow - I didn't think anyone would recognise that

I've used a few of those modular assemblies, they allow you to build custom connectors with eg. high current motor power, 24V PLC I/O & encoder feedback in a single unit. You can even get such as Ethernet and RF modules, with screening as appropriate.