I'd contact an antique shop in your area to see if they are interested or could validate the price for you. You might want to list them in the Antique section of your local Craigslist. I'd suggest doing it in the cold weather months as someone may find a way to decorate them for the holidays.

I think those might have the most value to an artisan who builds replicas of old equipment.

Thanks for the input. Just heard about someone who has horse tack auctions a couple times a year. Might have to check into that also. Hopefully we can get them sold for a fair price.