It’s a great belt! You might even find a buyer on here. There are also private groups on Facebook that are aimed at specific areas of turquoise and Native American groups. For example, Native American Jewelry Lovers, NA Jewelry Lovers 2, Hopi, Pueblo and Navajo, turquoise theory, Study of Antique NA Jewelry etc. There are also places like FB marketplace and Craig’s list but I personally and somewhat leery because you don’t know who might pop up. There is also EBay with their fees. If you do choose to sell via Facebook, check out the buyer (even ask one of the administrators) and ALWAYS USE PAYPAL GOODS AND SERVICES. THAT HELPS PROTECT YOU. I have used that venue a lot and made some good friends.
To help determine a asking price, check out sold EBay listings, sold auction prices and maybe reputable dealers like Perry Null (where you currently are.)
Best of luck! Just a reminder, NA isn’t just restricted to western wear. I live on a SC barrier island within 6 miles from the beach and wear mine daily. Even with shorts and flip flops. Never to the beach though. I have met some very nice people talking about turquoise. Some very knowledgeable and others who only admire a piece. We have a lot of tourist traffic and the time share brings in people from all over. Have a wonderful day!