Hmm... Courbette sent me information on my 1980 Felsbach AG/Courbette Husar saddle. This brand is Sattlerei beim Kloster Schonthal and was bought out by Courbette in 1976. However, saddles made between 1976 and 1984 have a Courbette plate and a Sattlerei beim Kloster Schonthal or Felsbach AG logo on their billet protectors, and the nailheads are uncolored. I sent them the serial number on mine, and they told me that it was made in 1980 in their Swiss factory. Of course, mine is not quite as old as this one and is both a Courbette and a Felsbach AG. As far as I know, Courbette is still in business though.
All I can tell you about the age is that if it does not have a Courbette plate as well, it was made before 1976.
Did you send them the number on the saddle or was that information provided?