There’s decent information on one son, Paul Ysart, because he’s acknowledged as one of the fathers of the renaissance of paperweight-making.
The various types that he made are pretty well documented, whether it was millefiori or lampwork, flowers, fish, birds, ducks, stuff like that.
Clairs from Elwood, Indiana in the book American Glass Paperweights and Their Makers by Jean Melvin (1967 & 1970).
Caithness glass was founded by Robin Sinclair in 1961, in Scotland.
Local natural gas production faltered in 1938 and the St. Joe retired for the first time) in 1971 and sold the factory to new owners in Elwood, Indiana. Clair and his wife Maude opened a new factory in Elwood. Clair retired from General Motors and joined Bob, along with Ed St. Sometime later after Bob opened his factory, the new owners of the original factory sold the factory back to Joe.
Clairs began to develop their ideas for a new business of their own. Clair (1909 - 1987) did the original experimentation and the business was formally started in 1941 in Elwood, Indiana. and the brothers John, Jr., Joe, Ed and Bob all participated, while another brother, Paul, did not at first. Clair paperweights were being sold through Georg Jenson on Fifth Avenue in New York. Those were made under different owners starting in 1971 or later. The bottom is fire finished flat and hot stamped in the center with the "GERONIMO" mark. Signature: Hot stamped "GERONIMO" on the bottom, but the remainder of the signature stamp is missing.
Clairs made more paperweights than any other single factory. A very large egg shaped paperweight with a sulphide of an owl sitting on a branch in a snow covered woods. The ground is a pleated crimp ground of brown and white glass. Often the object is surrounded by a millefiori or lampwork garland, but it may also appear alone. Sometime later, the new owners of the original factory sold the factory back to Joe. Clair factories, one owned by Joe and the other owned by Bob St. Large Size: 2 1/16" wide by 4 3/8" long by 2 5/8" high. For extra pictures, click on the picture at the right and the following links: Joe St. The ice-pick flowers are yellow, white, green, pink, and blue. This style of flower is called an ice-pick flower because of the ice-pick like tool used to push each flower down to the ground to form a stem. Clair line (as far as paperweights are concerned) started with John "Pop" St. who worked at the George Mac Beth Glass Works in Elwood from around 1903 to 1938. This is a miniature red crimp rose intended to be a perfume stopper or perhaps a lady's gearshift knob.
Clairs, but also others including John Degenhart, so it is sometimes difficult to be sure who made a particular item unless it was signed. Clair was born May 18, 1919 and passed away in 1986. This stamp, with only BOB, can be found with either raised or indented lettering. Local natural gas production faltered in 1938 and the St. Condition: Excellent condition with no chips or cracks or scratches found on inspection. Clairs began to develop their ideas for a new business of their own. Clair (1909 - 1987) did the original experimentation and the business was formally started in 1941 in Elwood, Indiana. and the brothers John, Jr., Joe, Ed and Bob all participated, while another brother, Paul, did not at first. Clair paperweights were being sold through Georg Jenson on Fifth Avenue in New York. This probably dates from the 1960s or 1970s, but may be earlier. The paperweight end is faceted with four side facets plus a top facet.
I learned that the father, Salvador Ysart, had four sons, and they all worked for a company called Moncrieff Glass.
Caithness is best known for its production of glass paperweights, which began in 1969.
Designers at the factory from 1970's onwards include Colin Terris, Margot Thomson, Alastair Mac Intosh, Philip Chaplain and Helen Mac Donald. In 1991, Caithness was bought by Drambuie, and was sold to Royal Doulton in 1996.
Salvador and two of his sons, Vincent and Augustine, left Moncrieff Glass in 1946 and formed a company called Ysart Brothers Glass.
They made paperweights, glassware, bottles, dishware, etc.
Joe retired (the first time) in 1971 and sold the factory to new owners in Elwood, Indiana. Condition: Excellent Condition with no chips or cracks. The normal signature stamp for this paperweight is "ST. For extra pictures, click on the picture at the right and the following links: Magnum St.