Just wondering if anyone would know the history of this sign..... mainly the time frame it would have been used.

Over the years I have looked at past auctions and images on the internet and haven't found one like it.
I can't even find the same color combination.

It's 26" thick porcelain with very heavy shelving and stamped NELKE-VERIBRITE SIGNS-N.Y. with no date of manufacture on it.
Any help would be greatly appreciated.