6914 Oddity is my nickname for this station. I've been hearing it for a few years now. It uses a variety of modes on 6914, including AM, MCW, and RTTY. It was just on now with an OM counting. Earlier this morning it was sending messages in MCW and RTTY. The MARS net was on 6913 at the time. I'm not sure there was any relationship to the MARS net.
When active, it will transmit for a minute or two, then go silent for a few minutes, then come back on the air. So it pays to sit on 6914 if you want to hear it (or record using your SDR). Months can go by without any activity, then it will become active, often for a few days.