My opinion is that they are pieces of Delftware mid 18th Century made by the Dutch.
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If these pieces came from St. Lucia, they could have been owned by the French or British which each ruled this small island 7 times up until 1814 when finally it became British and received full independence in 1979.
This particular pottery was highly sought after throughout Europe.
Keep searching this area as where pottery is located... so goes Treasure!
Agreed, mostly 19th C blue & White.A lot of what you have is mid 19th century Staffordshire (English) transfer ware. They "transferred" the pattern onto the pottery before putting it in the kiln.
Now, the blue and green "feather edge" is around 1780-1820 or so. We occasionally find it on late 18th century sites, and sites going into the 19th century.
The pieces on the right are called "mocha ware" and it was popular ca 1820-50's. The one tannish piece on the left is a stoneware. Stoneware on that small a piece is very difficult to date, but it probably dates to the same period.
Delft was much more fragile and you would see a lot more "flaking" of the coating with all the design coming off the coin if that was Delft. Delft used a tin glaze which was very fragile.
The only piece I see which I would say is absolutely Delft is to the right of the piece of stoneware (tan piece).