All reports of debian-watch-file-standard for the archive. The extended description of this tag is:
The watch file uses this version standard. The currently known watch file versions are 2, 3 and 4. Version 1 means it was undeclared.
Refer to the uscan(1) manual page for details.
This tag is a classification. There is no issue in your package.
This tag has not been emitted in any package tested by Lintian.