A friend of mine bought a music store that I used to go to in the 70s. I loved this F-Style mandolin that they always had in there so my friend sold it to me for 200 dollars. It plays great. Its a Sigma Mandolin and the sticker inside says CF Martin Co. Made in Korea. It is in near perfect condition. I have looked all over the internet for some info on them and I can seem to find any. The Price tag from 20 years ago read 900.00 but I also know that the store was a be pricey. The question is, any one have any idea as to the value of this mandolin? Approximatly?