The YF Series is a concert or grand-concert shaped guitar and has less depth in the body compared to a traditional dreadnaught. The period advertisement below says the “YF-Grand Concert Series is designed for ladies, children and even for the small-handed players.”

Though advertised as “small and easy to play,” the dimensions are very close to a traditional dreadnought. Length (~101 cm) and string spacing are similar between the YF and YW series. The width at the bottom of the YF guitar is within 1 cm of the YW. The main difference is that the YF is ~9.5 cm deep straight across the body, where as a the YF at its thickest point is ~12.5 cm deep. Lastly the YF uses standard length acoustic strings like a dreadnaught.