Grindelwaldgletscher RPPC flown on the Graf Zeppelin LZ127 airship's 1929 Schweizfahrt / Swiss Flight, with Bordpost / On-Board cachet as well as Luftschiff on-board CDS. Dropped at Biel with CDS from that town. Slightly worn, slight bend at lower right corner, very good, genuinely used condition with on-board passenger message(!), as per scans. '17 CV EUR700. Only 131 dropped of all types. Scarce!