Re: What version of Epiphone Les Paul is this?
That's not an open book headstock...that's just a regular Epiphone headstock. The 1989 through 2003 Epiphone Les Pauls all had the "Gibson" truss rod covers like that. 1989 had the open book headstock, 1990 on had Epiphone's modern day dog ear headstock.
It is an Epiphone Les Paul Standard, made in Korea.