The Hollywood Senior is a one piece casting. Made in cast steel or aluminum. The one with the "tie rod" was part of the 1961 redesign and other improvements to the linkage.
There seems to be no date to when aluminum took over from cast steel, or if both were produced together. Hollywood ads do not give any information and early factory litrature is worse than non existent.
As for the hole in the top, I am assuming that it is from part of the manufacturing process, that is, how the casting was clamped in the lathe for turning. Very early Seniors do not have the hole tapped 7/8-14. Though many did have a "top nut" installed to fill the hole.
Hollywoods enjoy a great reputation for all sort of claims. Though in reality they are no different than the typical steel H press of that time. (1953)
Your press on eBay would sell in the $135-150 range and possible higher depending upon who has auction fever.
Ken