Rare Taylor guitar from early 80’s

Taylor A-15 Artist Series Jumbo Guitar Sitka Spruce top, Curly Maple back and sides. Great sound clarity with a big jumbo voice. Handmade and signed by Bob Taylor in Lemon Grove, CA sound hole design painted by Kim Breedlove. I’ve seen photos of similar dreadnoughts, but no jumbos. So few were made and have ever been on the secondary market that even Taylor could only guess on valuation. Any ideas?