20 years of German unity - Zeppelin mail

No, the date October 5th, 2010 is not a misprint, the zeppelin flight on the occasion of the anniversary "20 years of German unity" should of course have taken place on October 3rd, 2010. Due to a technical defect, however, the airship could not take off and on October 4th the weather thwarted the pilot's plan. On October 5th, however, the time had come, the zeppelin took off and this letter was on board: it is stamped at 55 c. "The celebration of German unity in Berlin" franked, plus the unique black, red and gold special cancellation!