H in cursive - possibly Honora Jewelry Company. Honora produced fine gold jewelry, and used the trademark, capital H in cursive style, although primarily concerned with pearl type jewelry.
What a sunning piece of jewelry however it is not a brooch but a fur clip. How you can tell it is a fur clip and not a dress clip is by the twin prongs on the back of the jewelry that have sharp points. Fur clips were popular in the 1940s.
The jewelry mark might be Wm Huger & Co., Inc. 44 Marshall St. Newark, N.J.
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