Greetings my Gassan-aholics. Put on your sun glasses and hold on to your seats! You are about to witness Gassan Nirvana. As you know Gassan Sadakatsu is Sabaku Samurai's favorite sword smith of all times. He is considered by most to be the TOP 20th century sword maker. He was the maker to the Imperial Household in the first part of the 20th century. He made swords for the Emperor of Japan, high ranking military Officers and dignitaries. One of his blades is on display in the Tower of London along with the British Crown jewels. The most rare and coveted type of sword Sadakatsu made was the Kogarasu-maru. The Holy Grail of his Kogarasu blades, what everybody REALLY wants is a Kogarasu sword done in ayasugi hada. . Ayasugi is the result of folding and welding the steel so that an even undulating pattern is visible on the surface of the blade when the sword is properly polished. How to make this pattern was a closely guarded Gassan family secret for centuries. Sadakatsu made very few kogarasu style swords and even fewer using his distinctive ayasugi family tradition. Collectors all over the world seek them out and are willing to pay a stupid amount of money for them. Here, brought to you courtesy of Sabaku Samurai (at no extra charge) is a world class example for you to gawk at . This blade has an impressive 26 7/8 inch cutting edge comes in it's original shirasaya and sports a solid silver habaki made by Sadakatsu himself. It is signed "Osaka ju Gassan Sadakatsu kitau saku" and dated 1940 and has the unusual round shaped mune or spine called maru-mune.