This is an advertising Porcelain small size flange sign. Probably about 1910-20s is what I was told.
Don't see any Mfg. GREAT condition for it's age. Some surface rust where porcelain has been chipped. 16" by 6" in size. The item "Early 1900 WALL PAPER Product Business Cobalt Blue Porcelain Street FLANGE Sign" is in sale since Thursday, April 16, 2020.
This item is in the category "Collectibles\Advertising\Merchandise & Memorabilia\Signs\Original\1930-69". The seller is "vintageantiquesdotbiz" and is located in Lakeland, Minnesota. This item can be shipped to North, South, or Latin America, all countries in Europe, Australia, Japan, China, South Korea, Indonesia, Taiwan, Thailand, Hong Kong, Israel, New Zealand, Singapore, Saudi arabia, United arab emirates, Qatar, Kuwait, Bahrain, Malaysia, Bangladesh, Brunei darussalam, Egypt, Jordan, Cambodia, Macao, Maldives, Pakistan, Reunion, Viet nam.