One isn't liable to come across TV lamps marked N.Y.S. often. It's possible that the initials stand for New York Statuary, but that's pure conjecture on my part.
Similar to chalkware ballerina TV lamps from other makers, this one is from N.Y.S.
|The back is marked, N.Y.S. © 1955 on the left...|
|...and DeLorenzo on the right.|
|This is how a TV lamp was meant to be seen!|