Tom, I think it's kind of hard to determine from the sleeve. If you check the LP, if it's an early 1968 pressing the label will be two-tone, rose and cream like colors, if pressed late in 1968 it may have a yellow label. I think when "Ball" was release in late 1968 early 1969 it had the yellow label. If my memory serves me correctly. I used to have all the early Iron Butterfly LPs. I saw them live in Seattle in 1969.
Larry