Hello,
The Mercure was an unsuccessful attempt by Dassault to enter the commercial airliners market.
Only 10 units were built plus 2 prototypes that were refurbished for being delivered to the only customer Air Inter.
Only one type was manufactured: 100 type.

In our database we find pictures of these aircrafts, but unfortunately with model being "Mercure" (60 pictures)
example: https://www.jetphotos.com/registration/F-BTTA?term=F-BTTA

or "Mercure 100" (67 pictures).
example: https://www.jetphotos.com/registration/F-BTTJ?term=F-BTTJ

I think it should be nice to homogenise the designation to ease searches in the database.
Have a good (spotting?) day.