The new site improvements have already been of great help. It's much easier to peruse posts and pics in my op. I had some doubt about the hull number on my early '71 DS2. According to my MI boat registration it's #25873. The sequence just didn't make any kind of sense to me. Since there was no trace of the ID plate, it was all I had to go on. After a scouring the gallery for just a short bit, I noticed a partial hull registration doc in 'hightides' gallery (last post 9/24/2010) referencing a '71 DS2 owned by 'captaindad' (last post on 6/27/2006). Captaindad has(had?) a '71 DS2 with a hull ID of #25881 with gallery pics showing the ID plate AND that it was an exact sister ship of my boat, badged simply as O'Day Daysailer (no DS1 or DS2 designation whatsoever). Even had the single vertical rudder gudgeon! Not knowing my boats 'roots' really bugged me, but now I'm confident it was built just eight units before captaindad's in 1971 and feel quite good about placing that number on my new sail.
ps: Sorry for the long winded way of saying Thanks Again!