eight sided platter with picture of windsor castle

i just found that the writing under the diamond might say {registered...1849 mellor,venables.co}

Here is a site with the diamond mark key: http://www.pottery-english.com/Articles/Pottery_Marks/Pottery_Marks_Patent_Office_Registration_Marks_And_Numbers/ I can't make out the marks in your photo's (fuzzy on my screen) but this should help. The lack of the word "England" means it is probably pre 1820 in date (the US Tariff Act of 1820 required all imports have the country of manufacture on them), or it was never an export piece. "Made in England" was required when the act was amended in 1921. The crackling of the glaze over that kind of time is common and expected. It does impact the price but only slightly. The other damage is extensive and will require significant restoration. The good news is that it's in the rim area with a basic pattern - so restoration is possible. If it was in the central area picture, that would be very problematic. The damage will significantly reduce it's price. Check the marks to see what dates etc. you come up with. Garry

Here is a site with the diamond mark key: http://www.pottery-english.com/Articles/Pottery_Marks/Pottery_Marks_Patent_Office_Registration_Marks_And_Numbers/ I can't make out the marks in your photo's (fuzzy on my screen) but this should help. The lack of the word "England" means it is probably pre 1820 in date (the US Tariff Act of 1820 required all imports have the country of manufacture on them), or it was never an export piece. "Made in England" was required when the act was amended in 1921. The crackling of the glaze over that kind of time is common and expected. It does impact the price but only slightly. The other damage is extensive and will require significant restoration. The good news is that it's in the rim area with a basic pattern - so restoration is possible. If it was in the central area picture, that would be very problematic. The damage will significantly reduce it's price. Check the marks to see what dates etc. you come up with. Garry

Here is a site with the diamond mark key: http://www.pottery-english.com/Articles/Pottery_Marks/Pottery_Marks_Patent_Office_Registration_Marks_And_Numbers/ I can't make out the marks in your photo's (fuzzy on my screen) but this should help. The lack of the word "England" means it is probably pre 1820 in date (the US Tariff Act of 1820 required all imports have the country of manufacture on them), or it was never an export piece. "Made in England" was required when the act was amended in 1921. The crackling of the glaze over that kind of time is common and expected. It does impact the price but only slightly. The other damage is extensive and will require significant restoration. The good news is that it's in the rim area with a basic pattern - so restoration is possible. If it was in the central area picture, that would be very problematic. The damage will significantly reduce it's price. Check the marks to see what dates etc. you come up with. Garry

Here is a site with the diamond mark key: http://www.pottery-english.com/Articles/Pottery_Marks/Pottery_Marks_Patent_Office_Registration_Marks_And_Numbers/ I can't make out the marks in your photo's (fuzzy on my screen) but this should help. The lack of the word "England" means it is probably pre 1820 in date (the US Tariff Act of 1820 required all imports have the country of manufacture on them), or it was never an export piece. "Made in England" was required when the act was amended in 1921. The crackling of the glaze over that kind of time is common and expected. It does impact the price but only slightly. The other damage is extensive and will require significant restoration. The good news is that it's in the rim area with a basic pattern - so restoration is possible. If it was in the central area picture, that would be very problematic. The damage will significantly reduce it's price. Check the marks to see what dates etc. you come up with. Garry

Here is a site with the diamond mark key: http://www.pottery-english.com/Articles/Pottery_Marks/Pottery_Marks_Patent_Office_Registration_Marks_And_Numbers/ I can't make out the marks in your photo's (fuzzy on my screen) but this should help. The lack of the word "England" means it is probably pre 1820 in date (the US Tariff Act of 1820 required all imports have the country of manufacture on them), or it was never an export piece. "Made in England" was required when the act was amended in 1921. The crackling of the glaze over that kind of time is common and expected. It does impact the price but only slightly. The other damage is extensive and will require significant restoration. The good news is that it's in the rim area with a basic pattern - so restoration is possible. If it was in the central area picture, that would be very problematic. The damage will significantly reduce it's price. Check the marks to see what dates etc. you come up with. Garry

Apparently when we hit POST our page goes blank and we keep re-posting our comments ! SORRY :)

MELLOR VENABLES &CO Burslem 1834-1851 Windsor is the pattern. I collect blue/white china and haven't seen much around but, there was a dig in California in 2004 in Georgetown where they found several pieces and a lot of shards from Mellor. Yours looks like it has been in dirt. LOL Probably not from that dig because they sent all that to the Gold Rush Museum at Coloma. As far as value goes I saw a plate online with a small chip for $30.00 that has a similar mark as this. Not Windsor though.