Bone china plate with Adderley-style backstamp

This item is a circular white plate, appearing to be manufactured from bone china. The underside features an off-white or cream-colored glaze with a prominent printed backstamp in dark ink. The mark is consistent with those used by the English maker Adderley, featuring a small crown icon above the year '1789'. Below this icon is the stylized script 'Adderley', followed by the block text 'FINE BONE CHINA', 'ENGLAND', and 'ADELPHI'. The 'Adelphi' designation likely refers to a specific pattern or line. The plate has a raised foot rim and a scalloped or wavy outer edge visible at the top of the frame. The surface appears to have a high-gloss finish typical of vitreous glazed ceramics. Based on the style of the backstamp, this appears consistent with production from the mid-20th century, though physical inspection would be required to estimate age or verify provenance. The visible portion of the glaze shows some minor irregularities and shelf wear along the foot rim, consistent with a used vintage piece. While the markings suggest an Adderley origin, they are unverified without professional authentication to rule out replication or later application.

Based on my examination of the provided image, I have evaluated this circular plate which bears a backstamp consistent with the English maker Adderley under the 'Adelphi' pattern designation. The mark, featuring a crown icon and '1789' (referencing the firm's historical roots), is characteristic of bone china produced in the mid-20th century. I can observe a scalloped edge and a high-gloss glaze typical of vitreous ceramics, along with minor shelf wear on the foot rim. From a photograph, I cannot verify the exact age, the precise mineral composition of the clay body, or the presence of subtle restorations. The estimated value of $15 - $35 reflects the current secondary market for mid-century English bone china tableware, where demand is generally driven by collectors seeking to complete sets or individual decorative pieces. This valuation assumes the attribution to Adderley is correct; however, I must treat this as a working hypothesis, as markings can be replicated or misapplied. Should a physical inspection or provenance documentation reveal the piece to be a modern reproduction or a later copy in the style of Adderley, the value would likely decrease to a nominal decorative range of $5 - $10. To confirm the item’s status, an in-person examination by a specialist in English ceramics would be necessary to assess the glaze depth, weight, and translucent properties under transmitted light. Given that mass-produced vintage tableware lacks the rarity of fine art, the value remains modest despite the recognizable branding.