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I’m trying to find information on this piece ( rarity, value, etc..) but can’t seem to find any. I bought it for my wife recently for Christmas. She has a 9 and 10 inch bowl already. This one is a 15 inch. The markings are ink stamped in the 9 and 10 but the 15 has either hand carved or molded marks.
Thanks for any information you may pass my way.
http://www.oldantiquepottery.info/rrpco.htm
RRP was one of the major Ohio potteries !! They used several marks over the years !! Your mark on the 15 inch bowl would be between 1900 and 1920 when they merged with Robinson Clay Products !! You can usually find these spongeware bowls reasonably on ebay !!