The position for US guitar producers got challenging in the late 1960s, when guitars made in Japan, which looked remarkably similar to US guitars, flooded the market at a much lower price. The dominance of US manufacturers on the market was gradually threatened by these guitars, and a few American companies responded appropriately: they did not take legal action, but instead began a counter-offensive. "Sigma Guitars" was born as a result of this.

The brand "SIGMA" for acoustic guitars was introduced in 1970. They were constructed by specially trained employees in Japan's most efficient guitar factories, then shipped to the United States for inspection before being released for sale and distribution to music retailers.

The earliest Sigma guitars created in Japan were very different from those made in other nations in the subsequent years. After several years of production, the guitars were relocated to Korea, with new model numbers and a new logo. From now on, every guitar will proudly display the inscription "Sigma Guitars Est. 1970" on the headstock.

"Sigma Guitars" quickly earned a stellar, if not legendary, reputation. Some models were said to be of exceptional workmanship and sound quality. As a result, it's striking, but not surprising, that there aren't many used Sigma guitars on the market. The majority of owners still cling to their instruments and would never sell them. Fans, communities, and websites dedicated to Sigma guitars exist, as well as collectors that specialize in Sigma guitars.

They are devoted to and obligated to this custom. They consider it a tremendous honor to have been able to gain the rights to the time-honored name "Sigma Guitars Est. 1970" as well as the distinctive Sigma emblem for various regions of the world as a distributor of superb acoustic and classical guitars for over 25 years.