Nick Sisley wrote an article for Shotgun Sports Magazine several years ago about Parker Reproductions, Mr. Sisley interviewed Jack Skeuse to gather information for the story. Here's a link to this article which is posted on the PGCA album pages, the article is six pages long and contains production figures of the various Parker Repro offerings including the 0000-frame guns, when you're done reading the first page scroll down and click on "Next Picture" to continue reading the article.
http://parkerguns.org/forums/album.php?albumid=99&pictureid=1032