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This is (July 2012) evidently out of print in English and Italian versions - copies must be searched for in the usual places - is in Italian, and hard to find, but indispensible and superb, based on thorough patent and advertisement research, and giving dates and designers for pieces.
This is available - both new and second hand at this link.
Entirely focused on Trifari, as the title suggests, it's particularly strong on the 1950s and later, nicely complementing the Brunialti books.
I invite you to learn about vintage costume jewelry by visiting these pages.
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You can ID some of the jewels they made through this period through Be sure to go to antique fairs to look at and hold real Eisenberg jewelry.
Then you will understand how it is made and what the backs look like (many online dealers show images of backs) so you don't end up with a cheap knockoff, or worse yet, fake Eisenberg. These were wholesaled to department stores like Sears and J. Penny's, who would put the jewelry in their own gift boxes.