The images dont show it real well but its definately a 4 pc mold. the verticle seams run from the neck to the base crossing the horizontal seam. the dont line up perfectly at the horizontal seam, maby 1/16 inch off.
I cant seem to find much about 4 pc mold bottles, I thought it might help to...
Have a little more time now and got it out of its box to get some better pics and its measurements.
If anyone knows i would also like to know its aprox, worth as well.
It is 11.5 in tall, 7 in wide and 4.5 inches thick.
Its a 4 piece mold with what looks to me like a glass tipped pontil...