Usually these UD oversized cards were done in multiples of 5, many times 5 for each series. I think they also did 6 sometimes. Also, they were usually numbered on the back 1 of 5 or 2 of 6. Sometimes they followed the set.
-- Dan --
Note: Please see my profile for more info regarding trading (section updated 10/25/2023). I have added a large portion of my inventory to the site, and currently have trading turned off (details are in my profile). I have (finally) unearthed my 2 very large boxes of Star Company minor league sets and they are available (email for details).