Royal Copenhagen Porcelain Marking with Production Date '1858'

The image displays the base or underside of a white ceramic or porcelain item, featuring distinct manufacturing marks. Central to the composition are the iconic three blue wavy lines, a well-known motif of Royal Copenhagen porcelain. Above these waves, a faint circular stamp is partially visible, likely the Royal Copenhagen crown mark, though it is somewhat obscured and discolored with light brown or ochre-toned staining. To the left of the blue waves, the number '1858' is clearly visible, hand-painted in black. This numerical marking strongly suggests a production date, indicating the piece was manufactured in the year 1858, placing it within the 19th century. To the right of the waves, there appear to be additional hand-painted numbers or initials, '1C.B.' though this portion is slightly less clear. The surface of the porcelain is glossy white, but exhibits significant signs of age and handling, including dirt, grime, and potential residue in various shades of brown and grey, particularly around the manufacturer's mark. There is also a small, circular, dark hole, possibly a ventilation hole or a mounting point, located towards the upper left of the visible area. The clarity and precision of the hand-painted '1858' and the blue waves suggest good craftsmanship despite the age-related wear. The item appears to be an antique piece of Royal Copenhagen, highly collectible due to its age and the clear date marking.

I have carefully examined the provided image of the Royal Copenhagen porcelain marking. The presence of the iconic three blue wavy lines, along with the clearly hand-painted '1858' marking, strongly indicates authenticity and provides a precise production date. The partially visible circular crown mark further supports this. The additional hand-painted '1C.B.' likely refers to a painter's initial or an internal factory code. Condition-wise, the piece shows significant signs of age and handling, including dirt, grime, and staining on the glossy white surface. This wear is consistent with a 19th-century item and does not necessarily detract from its value if the underlying porcelain is intact. The small circular hole is unusual; an in-person examination would be needed to determine its purpose (e.g., ventilation, mounting point, or a later alteration). Demand for early Royal Copenhagen pieces, especially those with clear date markings, is generally strong among collectors. The rarity of an 1858 piece with such a precise date is a significant value driver. Comparables from this era with similar clear markings are infrequently seen on the market, contributing to their desirability. Factors impacting value positively include the clear date and the established Royal Copenhagen provenance. Negative factors include the general surface grime and the ambiguity of the small hole. Without physical inspection, I cannot fully assess the integrity of the porcelain body, detect any hairline cracks, chips, or professional restorations. Full authentication, beyond what the marks suggest, would require in-hand examination to verify the porcelain body's composition, glaze characteristics, and to rule out any later additions or alterations.