Herbert was the eldest son of John, who founded the well-known firm of John Aynsley & Sons.
He had gained much experience in the manufacture of good quality china, having been in business with his father for many years. In 1907 Herbert Aynsley's youngest daughter married Hugh Irving, who was a sales representative for the Rubian Art Pottery Ltd in Longton.
This confusion is also widespread amongst other Booths patterns with the Silicon China "Crown" mark, such as Parrot, Netherlands, Pagoda, etc, which were all produced much later than the supposed 1912 cut-off point, as is evident from impressed dates.
As far as Rhead pottery goes, namely the work of Charlotte & her father, there is still confusion about a number of backstamps and when they were introduced (or replaced), since details were not recorded at the time with any clarity.
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The Doulton factory was established in 1815 in Lambeth, South London by John Doulton (1793 - 1873), who had previously been employed at the nearby Fulham Pottery.
In the mid 1850s John Doulton began experimenting with a more decorative pottery items.
Many glazes and decorative effects were developed including faience, impasto, silicon, carrara, marqueterie, chine, and rouge flambe.