A set of six Einstein letters, including two handwritten examples, headline the sale scheduled for June 27 in West Palm Beach, FL at Auction Gallery of the Palm Beaches. Auction president Brian Kogan enthused:

"Einstein's autograph is desirable enough but having two letters written completely in the hand of this genius is incredible."

The collection of letters descended in the family of Dr. Hans Maurice Cassel, an Assistant Professor of Physical Chemistry at the Berlin Institute of Technology in the 1920s. Cassel worked with Einstein on a number of scientific theories and formulae.

The letters were found by the granddaughter of Cassel in a file box left to her by her mother. The letters were written between 1936 and 1937 when Einstein was at Princeton University.

Albert Einstein signed letter (available away from the sale)

Cassel's correspondence with Einstein is documented in the Einstein Archives at Hebrew University in Jerusalem. The handwritten letters, written to Cassel in German, discuss theories they were working on. These are estimated at $20,000-30,000 apiece, whilst the others are listed at up to $10,000 or $15,000.

We have previously noted that Einstein's letters can make extraordinary investments with one showing a