I'd start locally with dealers in the type of item you want to sell. The first person to approach would be the person who sold it to you (or to the person who gave/left it to you).
Since you are not familiar with the market for your item, it would be useful to have a written appraisal of the item's worth done. Phone around to dealers in that type of thing and ask if they do estate appraisals.
That is, a value for an item that has been inherited and the value of which will be split among several heirs. This value is usually the value at public auction.
Insurance appraisals are much higher and are the replacement value of the item. Full retail in other words. EBay is well below the retail market.
Dealers often give verbal cash offers. While these are a type of appraisal, they allow wiggle room for the dealer to cover his overhead and still make a profit. This will be below the eBay value, probably.
Make an appointment. Keep the appointment. Be ready to wait in the shop while the dealer makes the appraisal. (This is for his protection not yours). You will pay for a written appraisal, but if the value is very low (you could be wrong about the value) he may not charge anything and refuse to write an appraisal as a waste of your money.
Free appraisals are worth every penny you pay for them.
Do not attempt to sell anything valuable until you have both bought and sold several items on eBay. There are too many pitfalls.
Also, you do know that when your customer sends his payment, eBay will hold that payment for 21 days against your good performance?
