The story in the second post is more interesting than the first post.
Anyway, my experience is this. I had a flat first I used to hit quite a lot, now I use more top slice and placement. But it was pretty quick, others have said its the fastest club level serves they have seen, and suggested 100mph. I played against a couple of guys who have been round the block, and i never talk about my serve or what speed because I dont really care.
One said it must be around 100mph, the other said, with due respect it could just barely be 100mph because he recalled a guy who had it measured at 100mph and he said it was a fair bit faster than mine. And that guys serve, apparently was something to behold.
Another time I was hitting at the club, and this guy was coming back from injury, a second team player and he was hitting OK. I never met him before, and the first thing he said to me (in response to the first thing I ever said to him in my life, which was "oh, were you injured?") was "yeh, I serve at 115, 120, but I am taking it easy today"
I was thinking...Hmm...well....thank you for telling me.
What the hell is it with players boasting about serves. if a guy has a 100mph serve plus and places it and wins games with it, you will know its a good serve by just observing. You will tell your mates that is some serve!
Anyway, i have kind of lost track, I dont even hit it as hard as i can anymore, I focus on spin and placement.
In the end who cares - I love to see a nice fast serve, and if you have a great serve, let me see and judge for myself, don't tell me.