Hi, my name is*****'m a certified appraiser, and I"m happy to help.
How old is the sax? How much use has it had? Has it been recently serviced?
Fully tuned up and refurbished, from a reputable vintage music dealer, this would go for up to $8000.
If you are looking to re-sell yourself, it would likely be closer to $4000.
Please let me know if I can help further.
For insurance purposes, I would set coverage for your 1973 Selmer Mark VI alto saxophone at a retail replacement value of $8,000.00.
I see that this question is still open. How can I help you further?