1936 Olympic Zeppelin Flight Carried on Clipper to Hawaii

1936 Olympic Zeppelin Flight Carried on Clipper to Hawaii, 14.8.36 Berlin Olympic cancels tie 25c, 50c (2 Zeppelin) stamps (slight toning) envelope carried on the Olympic flight with the Europa-Nordamerika cachet, 10g (gram) blue crayon notation, mailed from U.S. Embassy to Hawaii, and carried from San Francisco to Honolulu via airmail on the Clipper, a possibly unique combination of Zeppelin and Clipper flights, VF. ex-Krupnick Estimate 1500-2000 US$
Dealer H.R. Harmer Auction
Opening Bid: 850.00 US$ (app. 650 EUR)

(via Philasearch.com: H. R. Harmer Auction Sale #3003 - item 9357-A3003-4430)