KM-E26 ; cf.Geo-51; Divo-P90. RARE proof striking showing no mint marks and with "ESSAI" to right of value. Steely semi-reflective surfaces throughout contrasting nicely with the frosty devices. Having been carefully handled over the years there are no adverse marks or disturbances and is completely worthy of its high gem state designation. The highest graded example with proof designation..NGC PROOF-66.