A.D. Copier rare blue Graniver flower pot 1930s

A famous A.D. Copier Graniver rare blue glass flower pot 1930s.
Very good condition, 2 little Surface pits. see last pictures.

Signed copier at bottom

    
Height 12 cm ( 4.72 inch)
diameter 12,5 cm (4.92 inch)

In the 1930's Leerdam glass factory began to experiment with a new technique which used small grains of glass and a pressing machine. The first results were called Graniver and the process was used to manufacture opaque pots and bowls.
In total the factory produced seven graniver products in a range of sizes and colours sometimes with stands or liners. The process was cheap and innovative but also brought some inherent problems. The bowls and dishes made in this technique are very vulnerable to chips and hairline cracks. The colour of the glass grains is often not thoroughly mixed, which leads to a marbled effect or other patches of darker colour.
This small group of objects has become a fiercely competitive area of collecting. 

Andries Dirk (A.D.) Copier (1901–1991) is regarded as the most important Dutch glass artist of the 20th century, celebrated for his pioneering designs at Leerdam Glasfabriek and his iconic “Unica” pieces