My husband says he thinks it is a name plate off of an old freezer or refrigerator. Carrier still makes new air conditioning systems. Hope this leads you in the right direction for your search!
Yes, it is indeed a vintage thingy. I'm guessing a plate label for a compressor? I love the vintage quilt background on your blog. Have a super duper Friday.
I am sure you will figure out what it is and have a use for it.