Hi and welcome - nice to see another SP on here!! We must have most of them on here now - apparently theres only 11 left in UK
You could start a whole new discussion to determine how many there were, are, which are numbered, licensed and SORN'd and it would go on forever... even the chaps that built them in Bologna aren't really sure!
Thats an idea!! Tho I did see a few Sp's at JHP over the last 12months while mine was in for an engine rebuild! At least three other SP's (and not SP3's - no plaques) Only got mine home today! She's been away a while but trackday on Sunday for a test run!
I wouldn't necessarily trust the plaques... someone tried to remove mine from the headstock but they were disturbed during the attempt. I removed it myself - which has led to some quite interesting conversations over the years. I would also take the numbers produced which are quoted with a pinch of salt having spoken directly with the factory. A lovely bike to look at and ride though...