The name Gassan is originally the name of a famous and symbol mountain there in the west part of Tohoku area just like Mt. Fuji in whole Japan.
The blacksmith has taken this famous mountain name into their business name. Their knives may not be well known in whole Japan but are certainly in the No. 1 position in Tohoku just like a crown in the kitchen knife field. Gassan makes each knife one by one with careful attention to detail and are well known for their excellent forging, heat-treating and grinding which are all done in house at their workshop.