1.There is a section in the book written by Tom Dimitroff and others that illustrate the fake signatures quite well. Unfortunately the fakers also see this information and try to correct there mistakes. The best advice I can give is to go by the shape and color. If in any doubt pass it up, there will be another one that will come along. Advice from an old collector.

Bobby Rockwell

2.There is a six page discussion with photographs of genuine and forged signatures and labels beginning on page 229 of Tom Dimitroff’s book.

Scott Hansen

3b. You can also see in the Gardner Book signature for Steuben glass along with fakes. The signature on the Sinclaire piece looks like it has a halo effect around the plumbs and the letters are a bit hazy.
Hope I was able to help.

Beth Shaut

fake

3a.Hi Alan,

I was told by Mr. Rockwell that Mr. Carder said that only 2 companies made a true Black and they were Steuben & Sinclaire. When holding to a bright light you will see only a pinpoint of white light. We have and have had multiple pieces of Black in the shop and I have seen this as true. Beth Shaut

From Tom Dimitroff’s Book on Signatures

The most commonly faked Steuben signatures result from the use of new and fraudulent matte acid fleur-de-lis stamps. They are often blurry and have a more transparent quality than genuine ones. They are also frequently found in incorrect locations on the glassware, such as on the inside center of a bowl or top of a foot.
abstracted from Tom Dimitroff’s book at page 229

Many a wonderful piece of Carder Steuben has escaped identification because the answer to the question, “Is it signed?” has been negative. Many Carder Steuben pieces are not signed. The signing or not signing of Carder object follows little rhyme or reason.

abstracted from Tom Dimitroff’s book at page 234