Nice piece by the way😊 By entering this site you declare you read and agreed to its Terms, Rules & Privacy and you understand that your use of the site's content is made at your own risk and responsibility.The diamond-shaped English Registry mark, was used by the English patent office since 1842 to identify pieces of English pottery, porcelain, and other products. The mark has the Roman numerals "IV" at the top of the mark if it is for a ceramic. Marks registered from 1842 to 1867 have a letter at the top of the diamond.
In the 18th century, companies like the East India Company imported the blue and white Chinese porcelains into England.The porcelain tea services and dinnerware were purchased at auction by Chinamen (dealers in china) in London and sold to their wealthy customers.This mark appears on decorative art (china, glass, metal, or wood) manufactured in England since 1884.Table 5: Design Registry Numbers—1884-2009 lists the English registry numbers by year.The one thing I have figured out is the time frame it was made based on the back-stamp (1893-1913). The markings or brand on Johnson and bros porcelain change during time.
The markings for those that were made between 1893 - 1913 are in green and a little bit rough and it read "Royal Ironstone China".
In other words, Mark "A" appeared on a piece of ceramics registered on June 2, 1850.
In Mark "B," the various letters and numbers reflect the following: the large "Rd" means "registered"; the Roman numeral in the circle at the top of the mark represents the type of material from which the piece was made (see Table 1); the Arabic numeral in the top inside section of the diamond represents the day of the month; the letter at the right-hand section represents the year the piece was registered (see Table 4); the letter in the bottom segment represents the month the piece was registered (see Table 2); and the Arabic numeral at the left-hand side represents the parcel number.
In terms of value, these pieces may cost between 30 -40$, depending on the demand.
There is a possibility you might get more, if listed on one of these auction sites e.g ebay.
The Coalport China factory created the Indian Tree design in 1801 and it was one of the most popular designs made by the company. ff3=4&toolid=10044&campid=5336649018&customid=indian-tree&lgeo=1&mpre=