The PSI's I purchased in 1993 had the script style and the ones I bought in the late 90's had the bold style, maybe just a change in how PSI wanted their logo to look?
It just brings me back to when PSI made pipes for the v-max4.. The ones with script PSI logos on them were 750's and the bold PSI logos were for 800's...Wunder if there is a difference in the way the pipe was made. ?