In descriptive geometry the academy had a magnificent collection of models, but they were shown to us after the study was finished --- in other words, mental discipline was the object --- practical helps and aims were secondary.

Arthur Hardy, USMA 1869

Quoted on p. 52 of The Best School in the World, by James L. Morrison, Jr.

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The department possesses also 26 models of geometrical surfaces, some of which are of marked value to the members of the third class when studying descriptive geometry. Those showing the forms and methods of generation of certain warped surfaces seem to be of especial assistance to them.

Annual Report of the Superintendent of the United States Military Academy 1896, p. 78.

I have begun a catalog of the string models that we have at West Point. Pictures of all 24 of our models are available. 

There are Olivier string models in several locations:

• Here is a list of string models in France. 
• There are also some at the Science Museum in London. 
• Columbia University had some at one time, but it is not known if they still exist.
• Harvard has a few.

There are several catalogs of models. A concordance is in progress. 

The Mathematics Department Diary, 1972-1973 contains the following information at tab 9:

Angela Vierling has a splendid page on mathematical models on their history. 

There are Olivier Models at the Universidade de Lisboa. 

Models made by the late Prof. Neukirch in Regensburg.