- Art Deco and Retro Jewelry.
- Convertible Jewelry.
- Magnificent Gemstones.
- Reflections Line with its “mix-and-match” components.
- Using the Glamour of the Movie Industry to Promote their Jewelry.
- Monsieur Rocher
- Opens a jewelry firm in Paris, eventually, this is becomes the House of Mauboussin.
- Birth of Randolph J. Trabert
- Birth of William Howard Hoeffer
- Trabert & Hoeffer meet while working for T. Kirkpatrick & Co.
- Mauboussin opens a shop on Park Avenue.
- Trabert & Hoeffer, Inc opened at 522 Fifth Avenue.
- Mauboussin moves to E. 51st and incorporates in the U.S.
- In addition, Mauboussin has a Palm Beach address.
- Death of Randolph Trabert.
- Trabert & Hoeffer opens a Los Angeles Shop.
- Hoeffer loans jewelry to the Paramount Pictures production The Gilded Lilly beginning a long tradition of lending jewelry to movies and movie stars.
- Trabert & Hoeffer moves the New York store to Park Avenue.
- Mauboussin closes its U.S. locations and liquidates the remaining inventory.
- Trabert & Hoeffer, Inc.-Mauboussin is announced as a merger, in fact it was more of a marketing ploy giving Mauboussin access to T&H’s Hollywood clients and allowed Mauboussin to work out issues with the United States Treasury regarding duties on earlier imports.
- Gustave Toth designed the Reflection Series.
- William Ruser moved from NY to LA to manage the Los Angeles shop.
- THM Opens a shop in Chicago.
- A patent is obtained covering elements for monogram brooches as part of the Reflection design line.
- Zodiac line is added to the Reflection series.
- Hoeffer monopolizes the entire output of emeralds from the Muzo mines, Colombia.
- William Ruser leaves THM and establishes his iconic Rodeo Drive jewelry business.
- Mauboussin severs ties with Trabert & Hoeffer.
- The Los Angeles location of T&H moves to 335 Rodeo Drive, Beverly Hills to be closer to their movie star clients.
- T&H liquidates its inventory at the Park Avenue location (sold in 1950 to Morris Kaplan & Maurice Gordon of Chicago)
- Hoeffer retires.
- Death of Hoeffer.
- Park Avenue store closes (at the end of the 20 year lease established when the building was sold.)
- Cutlers, Trabert & Hoeffer (est. 1961) closes its Florida location.