Polarstern is the German icebreaker research vessel that the Alfred Wegener Institute uses to support on-going polar research in the Arctic and Antarctic regions. This was returned to me at the end of it's most recent Arctic expedition. Normally they apply a cachet to the envelope with the date and cruise number but not this time. It is a new postmark though. Rectangular instead of rounded.
According to the schedule, the vessel was suppose to be in Tromso on the date this was cancelled. That would have been then end of PS114. It will be back in Bremerhaven in October before heading south in November.