My Suzuki Three S

Hi I was wondering if anybody has info on my guitar that I have had for around 23 years. Its a Suzuki Three S from the Suzuki Violin Company No 3180. It also has the No. RM 26019 on the label. Plays great in fact i haven't played anything better Gibsons, Ibanez, Fender, any of them. Played a Martin, it was as good but no better and similar sound. Is there any monetary value in my guitar. Its value is imeasurable to me because of its sound and playability, I just want to see if I sould insure it when i take it out to play.