You can look up the age by giving Salvi the serial number. Value is likely somewhere in the 8-10K range, but could be less if you have any damage. If it has not been played for a long time, you will probably want to drop about $8-900 into a full restringing, regulation, and professional appraisal. You would not want to buy a car in unknown condition, and harpists are much less likely to buy a harp in unknown condition, without a recent appraisal. Even if you leave the buyer to do the restringing and regulation, get it appraised. Otherwise, you are probably looking at more the 6-8K range. Contact Salvi or Lyon and Healy to ask what technician services your area, then find out when they will next be there. Even if you have to drive a couple hours to get it done, it’s worth it.