This very hard to find Northgate Omnikey Evolution keyboard is coveted among mechanical keyboard fans.  

It uses the venerable 'Alps' switches and has a very solid build quality throughout. 

This example appears hardly used and is in very good to excellent condition. Clean keys and intact lower raisers. 

I'm including an active USB adapter that allows the keyboard to be plug and play with Mac or PC. All keys tested successfully. 

I could NOT get the trackpad or mouse buttons to respond on Mac, but that might be a compatibility issue. 

The Num lock lights etc. illuminate when the keyboard is plugged in, but not when in use. Also could be a compatibility quirk.