I think we've all learned a lot from this thread. Here's a link to the Mastercraft Catalog that Vertugarde mentioned from the Denver Jewelers Buying Guide, 1932:
http://www.morninggloryantiques.com/imagesJC/Catalogues/cata13.jpg
http://www.morninggloryantiques.com/imagesJC/Catalogues/cata13.jpg