It is beautiful, well done.
As to what it is 'worth', you have indicated that you are keen to sell, so the question really is 'what will a buyer pay for it'. And only the buyer can answer that! An appraisal is all very well, but a sale is something else.
To get the best price I advise you to advertise it carefully, display it in public if possible and pitch it at high end purchasers, wherever they can be found near you.
I wish you a successful sale.