Hi there Blue Daisy,
You could always pay someone locally to valuate the coat for you. If you don't want to do that you could look up similar coats in the sold listings on eBay.
Active listings of similar coats can give you ideas about information that you could use in your listing. The active listings will not help you to determine value though because anyone can offer anything for any price they want.
The coat itself dates to the 60s and it has an autumn haze or pastel mink fur collar which you can reference and also note that it's a natural light brown, and the wool was loomed by Einiger. Einiger was a pretty big name at that time. People don't really recognize him too much today but it's neat to know that he was so big then.
I've had a lot of coats that were made by him and we've had a few of them posted here in our forums. They were not always designed by him but he made them. He mixed fabrics like vicuna and cashmere with wool that made them more affordable. That's not to discount his pure wool coats that were not blended. All of his stuff was popular and his coats often had fur trim.
