The "Lincolnshire Poacher" used to operate in that range but it was in English via AM mode and signed on and off with the tune "Barnacle Bill The Sailor" played on what sounded like a recorder. I haven't heard it in well over a decade.
I've heard CW up there for years. The Canadian Air Force used to operate in and around 6955 in SSB, but rarely, and I never remember them using CW for air comms there.
Hard to tell. Maybe a couple of hams screwing around with some tweaks and didn't want to do it in band on 40 meters until they had the bugs worked out?