Use the Lynn Palm name since it's stamped on there. It's a regular tree since it is numbered ART + number. I'm not sure how to price it. It's plain flap and no knee roll, and that's out of fashion. People want a padded flap now.
a free ad at bitsandbridles.com
A free ad at Horse Grooming Forum
$10 photo ad at tacktrader.com
Bits and barter board eBay
Craigslist (Local and other cities. Reword ad title slightly each time to list it multiple places and it might limit how many repeats / day so try different days.)