As others have mentioned, there's lots of large porcelain signs coming out of India. Just go to ebay and search on "porcelain sign 60" and a bunch of double-side, 60 inch fake signs will come up. Here's a couple examples:

https://www.ebay.com/itm/267319264452?

https://www.ebay.com/itm/336038684003?

Here's a 6 foot piece of junk:

https://www.ebay.com/itm/267148896894?