Wells Blue Bunny Milk Cooler

I found this at my grandpa's today. We were working on cleaning the place up, and in his scrap iron pile someone had set this Wells Blue Bunny milk cooler. I pulled it out and it came home with me. My mom said she can vaguely remember this setting out on the porch waiting for their milk delivery. I was wondering if anyone would be able to help me with how rare this piece maybe, and perhaps what a value would be? Thank You for any help.