I'm not certain but believe that St. Clair did make an Eisenhauer sulphide as wll as several other presidents.
If you go to Amazon and search 'St. Clair Glass', you may find 2 thin paperback books that were written awhile ago (mine are in storage).
While both of these have some nice pictures, they both only provide superficial information re. their output and the particulars thereof.
There are a few things that I have learned from midwest weight collectors as well as observing the comings and goings on ebay:
There are many different 'Hot Stamped' St. Clair signatures including but not limited to the following: STC, Hand made by St. Clair, Joe St. Clair, Maude & Bob St. Clair, Bob St. Clair (there are no solo Maude St. Clair sigs as far as I know), Ed St. Clair, Paul St. Clair. Sometimes the year is included too. I have seen the year as early as 1972 (maybe 1971) and as late as 1984. St. Clair, as they were in their various incarnations, ceased operations in 1987.
As to when Joe Rice fired up his 'House of Glass', I do not know for certain. He is a nephew of the St. Clairs.
Interestingly, I've learned that the hot stamped signature of the bottom does Not necessarily mean that that particular St. Clair actually made the weight. But you have to know a real St. Clairophile to discern all of the specifics.
I have learned some. For instance, Joe made some beautiful crimp roses. I've been told the estimate of his crimp rose output from the late 1960s through the early 1980s was around 1500 roses. His roses had 15 rose petals surounding a single central stamen. The are all hot stamped Joe St. Clair. Additionally, some that are cut/engraved carry the script signature of the cutter, 'Sid' (Sid Garret). As an aside, 'Jim' (Jim Beeman) has done some cutting for Joe Rice. Here's a pic:http://glassgallery.yobunny.org.uk/displayimage.php?album=66&pos=31
However, there are a few crimp rose weights extant that carry a Maude & Bob St. Clair stamp. These are much rarer and the crimp used to make them is different too, a 20 petal rose with a single central stamen.
Well, neither Maude nor Bob actually made these. Charles Gibson, who worked for them for a period of time, made them. Here's a pic:http://glassgallery.yobunny.org.uk/displayimage.php?album=66&pos=29
Crimp roses carrying the Maude & Bob stamp fetch premium prices. One sold on ebay a couple months ago for $1,000.00 USD, this because of the rarity of a rose stamped Maude & Bob. Joe's roses typically sell for around 5-600 USD, but for much more if they are footed, or blue, etc...
A rose carrying a Paul St. Clair stamp sold a few years ago for over $4,000.00 USD.
Any St. Clair weight carrying a 'Paul' or 'Ed' stamp will fetch premium prices as these are the rarest of the signatures, 'Paul' being the rarest.
As a final aside, a maker by the name of Mike Mitchell worked for the St. Clairs for a period of time. He was not known, to my knowledge, to have made any roses while working for them. However, he has made some on his own and also uses a hot stamp to sign his. Here's an example:http://glassgallery.yobunny.org.uk/displayimage.php?album=66&pos=34
I hope all this is somewhat helpful and illuminating.