Here is a true Slate Grulla, part of a herd from Russia.

这里是一个真正的石板grulla，一群从俄罗斯的一部分。

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Grulla can be distinguished from grey in that the head is dark and the color does not change with age.

Grulla可以区分从灰色，头部暗的颜色没有变化，随着年龄的增长。

youdao

In the Basque hill town of Eibar, near Bilbao, six bespoke manufacturers--among them Aguirre y Aranzabal, Grulla Armas and Kemen--lie within walking distance of one another.

FORBES: Magazine Article