Hi, my name is*****'m a certified appraiser and I'd be happy to help.
Can I ask where you saw one that sold for $32,000? I've seen this sign before but certainly not at that level.
Also, is the sign maker marked anywhere on the sign? Usually in small type in the margin/edge.
Unfortunately, that is an unverified claim. I have access to the actual auction records (through all those paid professional servers) and there is no record of a John Deere sign selling at that price level. It's possible one may have been offered on eBay at that price, but eBay asking prices are not used for value--most of them aren't achieved or verified.
This sign dates from the 1930s. The highest auction price for a similar sign to yours was actually $9,500. However, that example was in somewhat better condition as it had been professionally restored. Another sold for $7,250, and all other verified sales were under $5000.
The expected resale on your sign, in its current condition, would be in the range of $6,000-$7,500.
I'm sorry if that unverified, and untruthful, eBay claim led you to a higher expectation. Here at JustAnswer we are constantly handling the disappointment of people who believed untruthful eBay claims or wishful "asking prices" on eBay.