c. 1813–1820
PATENT IRONSTONE CHINA / WARRANTED
WARRANTED occupies a second line below the patent description; no crown.
printed
Pottery & porcelain
Mason's Ironstone China marks
Mason's Ironstone China marks include “G.L” on earthenware in England, United Kingdom. Mason's Ironstone China was active 1968–2005.
- Active years
- 1968–2005
- Country
- United Kingdom
- City / region
- England
- Products
- china, earthenware
- Marks
- 6
Patent ironstone from 1813; family manufacturing had earlier porcelain roots. Successors retained the identity, with Barlaston production continuing at least to 2005.
What to look for
- Early impressed marks occur in one line, two lines and circular arrangements. Printed crown marks were used alongside them.
- Read the complete lower wording. England and later colour guarantees distinguish successor versions from the earlier crown-and-scroll inscription.
- Warranted and the rare Siamese Jardinere wording are distinct inscriptions. A pattern name is separate from the manufacturer’s identity.
- Ironstone China became a widely used description. A crown and the word ironstone alone do not establish Mason’s manufacture.
Dated marks & timeline
6 marks
c. 1813–1820
MASON’S PATENT / IRONSTONE CHINA
The maker and patent name are divided into two lines rather than one continuous line.
impressed
c. 1813–1825
MASON’S PATENT IRONSTONE CHINA
All wording runs in a single straight line, unlike the two-line layout.
impressed
c. 1815–1830
MASON’S / PATENT IRONSTONE CHINA
Widely spaced maker’s name over a crown and scroll; no England or colour guarantee below.
printed
c. 1820–1830
Mason’s / Siamese / Jardinere
Three-line cursive inscription inside a beaded oval, without the standard crown.
printed
Undated
G.L
earthenware · England, United Kingdom
Variants of this style continued under G. L. Ashworth & Bros, Mason's Ironstone China and Wedgwood.
About Mason's Ironstone China
Mason’s Patent Ironstone China was introduced in Staffordshire in 1813, when Charles James Mason registered the patent and joined his brother George Miles in directing the business. Their father, Miles Mason, had previously retailed imported porcelain and developed his own ceramic production at Lane Delph. Ironstone offered a strong, comparatively economical body suited to large dinner services and ornamental pieces.
The factory became known for richly colored Japanese-inspired decoration, often combining underglaze blue with painted enamels and gilding. Its range included services, jugs, vases and display pieces. George retired during the 1820s and Charles continued the enterprise. Financial difficulties eventually forced the sale of patterns and shapes, which passed through Francis Morley and the Ashworth business.
G.L. Ashworth & Bros continued using Mason designs and related crown marks. In March 1968 the company was renamed Mason’s Ironstone China Ltd, and it joined the Wedgwood Group in 1973. Production moved from the Broad Street works at Hanley to Barlaston in 1998. A selection of traditional hand-painted shapes remained in production there into the early twenty-first century, extending the identity well beyond the original family factory.
Also known as: Mason's Ironstone China (as part of the Wedgwood Group) · Mason's · G. M. & C. J. Mason · C. J. Mason & Co. · G. L. Ashworth & Bros · Francis Morley & Co. · Morley & Ashworth · Mason family ironstone business and successors; later Mason’s Ironstone China Ltd
Look-alikes & how to tell them apart
Spode Stone China and other ironstone manufacturers
Other Staffordshire potters developed their own durable bodies and related Asian-inspired decoration. Read Mason’s Patent wording or an attributed factory inscription; ironstone is not an exclusive maker name.
Later Ashworth and Wedgwood Mason-pattern production
These are legitimate successors rather than early Mason-family wares. England, colour guarantees and later pattern wording distinguish the illustrated successor stamp from early examples.