Ceramic pottery mark, attributed to Royal Doulton (not authenticated)

This is a close-up photograph of a black printed manufacturer's stamp on the glazed ceramic base of a piece of pottery. The mark features a classic English lion and crown crest positioned directly above a circular emblem. The circular text reads 'MADE IN' across the top left, 'ENGLAND' across the top right, 'ROYAL DOULTON' wrapping around the central monogram, and 'ENGLAND' along the bottom edge, framed by short parallel lines on the sides. Below this circular stamp, additional text is clearly printed in a bold sans-serif typeface, reading 'YOUNG KOOKABURRAS' on the upper line and the pattern or design number 'D 6426' directly underneath. The background consists of a smooth, off-white glazed ceramic surface with very subtle speckling. The black print is crisp and legible with no apparent smudging or fading, showing characteristics consistent with mid-20th-century ceramic backstamps. The attribution rests entirely upon the visible printed backstamp shown in the image, though the item itself remains unauthenticated.

Based on the close-up photograph provided, I can observe a black printed manufacturer's backstamp featuring a lion and crown crest above a circular emblem reading 'ROYAL DOULTON' alongside 'MADE IN ENGLAND' and the pattern text 'YOUNG KOOKABURRAS' with the design number 'D 6426'. The print appears crisp and regular, with characteristics typical of mid-20th-century ceramic backstamps. However, based on what I can see, I can't verify from a photo whether the mark itself is contemporaneous or applied to a later reproduction, nor can I evaluate the condition of the broader ceramic piece that this base belongs to. I would need physical inspection to confirm the glaze quality, wear patterns, and overall integrity of the item. Assuming the attribution to Royal Doulton is correct for the sake of this estimate, decorative cabinet ceramics featuring Australian subjects like kookaburras generally attract collectors of mid-century character wares and pattern series, with comparable decorative pieces typically trading within the $150 to $250 range depending on the size and overall condition of the vessel. If the item were to turn out to be a reproduction, replica, copy, or lacking the intended manufacturer association, the value would drop significantly, likely limited to decorative value of $30 to $50. To achieve a more reliable evaluation and address whether this is an authentic period piece, one would need in-person examination by a specialist, evaluation of the glaze and body paste under magnification, and consultation with reference archives for pattern D 6426.