Yamaha FG420A acoustic guitar, featuring a classic design and rich sound. - Model Name: FG420A - Brand: Yamaha - Type: Acoustic Guitar Thank you for viewing. Regarding the string height and saddle remaining height, I measured them carefully. 12th fret string height: 1st string side: 3mm, 6th string side: 5mm Saddle remaining height: 1st string side: 3mm, 6th string side: 5mm I'm not sure how to measure for warping, but it's been 20 years since I purchased it. The strings probably need to be replaced. Thank you.