The condition is fantastic. To get an idea of value, just look on Ebay, where several Martin Ukes are for sale. It's hard for me to say exactly what year and model yours is, i'm no expert. If you want to sell it, you could simply put it up on Ebay, with plenty of pictures so people who know what they're looking for will be able to tell what you have. Most of the ones I saw listed there seemed to be fetching good prices, with competitive bidding .