Crown and Letters: The crown and letters "NW YW" on your vase indicate that it was made by the Newport Pottery Company. The Newport Pottery Company was founded in 1813 in Newport, Staffordshire, England. It produced a wide range of pottery items, including tableware, decorative items, and tiles. The company closed in 1936.
Value: The value of your vase depends on several factors, including its condition, size, and rarity. Staffordshire ironstone vases from the 19th century can range in value from a few hundred dollars to several thousand dollars. However, some particularly rare or desirable pieces can sell for much higher prices.
If you are interested in determining the exact value of your vase, you can take it to an antique appraiser or auction house. They will be able to assess its condition, rarity, and value based on current market trends.