Surprisingly, the non-PST II marked PST II is worth less than the PST II marked ones, from what I have seen. I like the ones marked PST II better myself. It ain't worth much. You'd be better off using it and enjoying it. IMO of course.
That is surprising as I reckon the non PST II marked PST IIs were only around for about one year - So are much rarerAnd for me it's almost like a manufacturing error - Which was fixed in the second year of production