Raytheon (now Raymarine) fluxgate compass for ST5000+ and similar legacy autopilot systems. I removed this from my boat when upgrading to a later system. It worked fine and has been stored in the dry since then. I am unable to test it now as I do not have the ST5000+ head unit any more. There is a 1m of cable attached and some paint splashes on the unit as can be seen in the pictures.
eBay