Olive Oil Museum in Nyon, France (Provence)

Nyon Olives taste 

The curator and guide at the museum gave us
information and welcomed any publicity

Nyon's olive oil tastes buttery.   Here is a delightful small museum with displays about the olive growing and process of producing the oil.
Location:  Musée de l’Olivier - Espac Vignolis
Place Olivier-de-Serres - 26110 Nyons
Tel: 33 (0)4 75 27 41 08 - 06 07 80 04 65E-mail: coudouria@aol.com 

Go here

They produced less, so it doesn't get exported much.  

According to Whole Foods Market Nyon: A small, jet black, shiny olive variety from southern France, this one will romance you. Nyon olives have a mild, salty bitterness and are usually dry-cured and packed in olive oil.
JK says, "Nyon olives are buttery."

LINK
Here's a link on Marvellous-Provence.com