Ceramic platter, bearing marks reading 'ONDA (CASTELLON)' (not authenticated)

This photograph displays the reverse or underside of an oval ceramic platter or decorative dish, presented on a dark fabric surface. The object is constructed from a heavy white glazed ceramic or earthenware material featuring a glossy, reflective finish with a scalloped, fluted rim edge visible along the bottom. Integrated into the recessed back are two raised loop-like foot or hanging elements, which suggest the piece was potentially designed to be hung on a wall for display purposes, showing some slight irregularities and blue pigment spots near the top hanging loops. Notable markings painted directly onto the unglazed or thinly glazed recessed base include handwritten black or dark ink text reading 'ONDA (CASTELLON)' and a stylized blue hand-painted monogram or maker's mark resembling a cursive letter or abstract symbol positioned below the text. The item displays condition characteristics consistent with vintage or antique pottery, including minor surface wear, slight discoloration, and standard manufacturing imperfections typical of hand-thrown or hand-molded ceramics. The identification and attribution in the name rest entirely upon the observation of the visible handwritten inscriptions and marks on the reverse, which remain unverified and subject to future authentication. The overall aesthetic is consistent with mid-to-late 20th-century decorative ceramics or regional Spanish pottery production, though the exact date of manufacture and precise workshop remain undetermined from visual evidence alone.

Based on what I can see in the photograph, this oval ceramic platter displays a heavy white glazed earthenware body, a scalloped rim, and integrated hanging loops on the reverse. I observe handwritten ink text reading 'ONDA (CASTELLON)' alongside a blue hand-painted monogram on the base. However, I cannot verify from a photo whether these markings are period-correct or if the piece is a later regional production. The value range provided assumes that the attribution to Onda, Castellón, is correct, reflecting typical market demand for mid-to-late 20th-century decorative Spanish ceramics of this type. Condition characteristics such as minor surface wear and manufacturing imperfections are factored into this assessment. To confirm authenticity and workshop origin, physical inspection by a ceramic specialist, hallmark verification, and detailed provenance documentation would be necessary. If physical examination reveals the piece to be a later reproduction, replica, copy, or merely made in the style of the workshop rather than an autograph production, the market value would likely decrease significantly, dropping to the $40-$80 range as a general decorative item.