AI Appraisal Estimate

This is the underside of a vitrified ceramic plate featuring two distinct manufacturer's marks. The base color of the china is an off-white or creamy ivory glaze. The most prominent mark is a green underglaze stamp for Knowles (Edwin M. Knowles China Co.), an American pottery manufacturer. This stamp includes the stylized 'K' banner crest and the alphanumeric code 'USA 52-11', which suggests a production date around November 1952. Adjacent to this is a secondary gold-overglaze stamp for 'Eastern China U.S.A.', noting a '22 K. GOLD' finish. This indicates that the plate blank was manufactured by Knowles and then decorated or finished with metallic gold accents by Eastern China, a practice common in the mid-20th century. The plate features a smooth, shallow foot ring and a high-gloss glaze finish. Physically, the item appears to be in fair to good vintage condition with visible minor brown spots (rust or mineral staining) on the surface and slight wear consistent with its age of approximately 70 years. There are no immediate signs of significant chips or cracks visible in this orientation, though the gold stamp shows slight fading.

I have examined the digital images of the Knowles/Eastern China utility plate. Based on the maker’s marks, I confirm the piece is an authentic product of the Edwin M. Knowles China Co., dated 1952. The secondary stamp identifies it as a 'blank' decorated with 22K gold by Eastern China, a high-volume decorator of that era. Physically, the plate shows fair vintage condition; however, the mineral staining and 'rust' spots mentioned are signs of glaze crazing or moisture penetration into the ceramic body, which negatively impacts the value. The market for mid-century American utility china is currently saturated. While the 22K gold finish adds decorative appeal, these items were mass-produced in the millions. Recent auction and secondary market sales for similar Knowles/Eastern China collaborations typically range from $8 to $25 depending on the complexity of the pattern. The condition issues (staining and gold fading) place this specific item at the lower end of that spectrum. Rarity is low, as these were standard household items. These findings are based solely on visual inspection of the provided digital images. A definitive valuation would require an in-person examination to check for 'ring' (structural integrity), hidden hairlines, and the exact depth of the surface staining. One must also verify the absence of lead-glaze degradation. No scientific testing has been performed to verify gold purity beyond the manufacturer's overglaze stamp.