The pattern is vintage and in the public domain. It's in the Priscilla Tatting Book number 3, and is a free download found on the Antique Pattern Library website https://www.antiquepatternlibrary.org/html/warm/tatting.htm scroll down and look for a green cover. Also found in a House of White Birches tatting book number 5.
The pattern is quite easy to vary in size once the basic pattern is understood.