I have nearly a full set of dinnerware marked Sierrastone by Interpace. The pattern is Idlewild. I have been unable to find much information online regarding this set and am curious as to it’s value and/or any other information.
Any information would be greatly appreciated.

The bottom of the plates read:

Sierrastone
FINE QUALITY DINNERWARE DESIGNED FOR COMPLETE SAFETY IN YOUR DISHWASHER AND YOUR OVEN…MICROWAVE, TOO.
© by interpace
FKT JAPAN
Idlewild

The book [i]Franciscan: an American dinnerware tradition[/i] By Bob Page, Dale Frederiksen, page 145, states:
“Sierra Stone Line
A new line of shapes appeared circa 1972-1975 called Sierra Stone. Oddly, the backstamp says INTERPACE but not Franciscan. The lines never appeared in Franciscan literature or catalogs, thus there is very little known of the line.”

[img size=150]http://i.imgur.com/HVuSnl.jpg[/img]