Just got a ZZR600

hi guys new to the world of bikes and just got myself a 1997 zzr 600,Silver over black, got it off a family friend and its only travelled 15,000klm.
been riding it around heaps and can now see why people dig it so much, i never thought i would get into bikes as much as i have.
one quick question though is i have read on here talk about D or E series 600's how do you know what you have and what are the main differences.
thanks in advance
Anthony
been riding it around heaps and can now see why people dig it so much, i never thought i would get into bikes as much as i have.
one quick question though is i have read on here talk about D or E series 600's how do you know what you have and what are the main differences.
thanks in advance

Anthony