Nobel Prize–winning German physicist (1858–1947) who pioneered the understanding of quantum theory. ALS in German, one page on the reverse of a 5.5 x 3.5 postcard depicting the Sonnblick mountain, August 22, 1932. Letter to Gustav Krupp von Bohlen und Halbach. In full (translated): “To the chairman of the board of the Sonnblick Observatory, in whose footsteps I am walking, I send my greetings and best wishes for summer recreation.” Two punch holes with small tears to the top edge, otherwise fine condition. Accompanied by a small unsigned photo of Planck. Pre-certified PSA/DNA and RR Auction COA.
This item is Pre-Certified by PSA/DNA
Buy a third-party letter of authenticity for
$75.00
*This item has been pre-certified by a trusted third-party authentication service, and by placing a bid on this item, you agree to accept the opinion of this authentication service. If you wish to have an opinion rendered by a different authenticator of your choosing, you must do so prior to your placing of any bid. RR Auction is not responsible for differing opinions submitted 30 days after the date of the sale.
