That's an interesting postcard, Pam. Yes, I think they changed the sign at some point.

Another note: the postcard says "Mr. & Mrs. Harold J. Stocker, Managing Owners".
It turns out that Harold Stocker was the son of Mayme Stocker, the owner of the Northern Club in downtown Las Vegas -- the holder of the first casino license back in 1931.

It's a small world!

For a rather wordy article on Mayme Stocker & family connections, see:
https://www.reviewjournal.com/news/mayme-stocker/