a three part mold could be considered a cup mold, just one with a really tall cup portion[]
For medicines, cup molds have been used through most of the 19th century, THey became extremely popular roughtly around the 1890s when post molds started being phased out.
Well Cows , I have to eat 'Humble Pie'. [:-] U R RITE!! I put the bottle up to the fluorescent light above my computer desk and sure enough, there are 2 very faint lines going from the top of the shoulder to the bottom of the neck, making this bottle a 3 piece mold and NOT a 2 piece mold as I had thought. MAN, it is soooo hard to tell under normal daylight but still I had to look good and hard to see it. The black glass is sooo back it s very difficult to see. U and A-Meds know your stuff! []Now I have to find myself a 2 piece mold bottle!!