It's a paint from a dutch brand called Flexa. They call this color 'Oester' which means oister in dutch. It is gray with a hint of purple.

You can find more information about this color on:

http://www.color-swatches.com/vtwonen/vt-wonen-kleuren/oester/1923/swatch.html.

I guess this site gives you enough information to have this color mixed at you local store.

Thanks for asking,
Kay