I have since read 4 different perfume reviews that Houbigant Ambergris became Monsieur Musk, which was originally by Houbigant, but last produced by Dana. Though it is not being produced any longer, it is still very easy to find.
Alyssa Ashley was bought out by Houbigant once upon a time, in case you were not aware of it. Alyssa Ashley and/or Houbigant Musk, Ambergris, and Civet were the same products as I understand it.
Both the Civet and Ambergris spray mists say "Houbigant" on the front of the bottles, but if you turn the bottles around they say "Alyssa Ashley Inc. Div. Houbigant Inc. New York, N.Y. 10019 written length wise on the back. These were the black aerosol bottles with silver caps with the eye logo for the Civet and the wave logo for the Ambergris (which also looks like it could be the fins of a whale breaking the ocean's surface).