I've got three that have special meaning;
Gtb Spiderman which was my first pin, purchased 31 years ago and still played regularly
Gtb Black Hole, attempted to fix this one for a guy and it was a total basket case, put so
much time and effort into it (and the owner knew it), he just gave it to me
Genco Formation (1940), fixed one of these for a friend who is a long time collector, it
was his first pin, about a month later found one for myself, have never seen another
Steve