Curtis Jere wall art

I’m also trying to get an idea of how much this 1980 Curtis Jere piece is worth. It’s available for $275–there are stores in the city that sell them for more than $1000–but then again I see them on eBay for $100. Sorry to use this forum to get advice on my design purchases, but I need your expertise! Don’t want to get ripped off. It’s 4.5 feet by 2.5 feet and signed.
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That is a really nice piece. Does it have a certificate of authenticity? I not, I would think you could get it on the lower end of the range.