Impressed Pottery Mark 'PRU' or 'PQU'

This appears to be a close-up image of a pottery mark, likely impressed into the base of a ceramic item. The marking consists of three characters, which resemble the letters 'P', 'R', and 'U' or possibly 'P', 'Q' (with a short tail), and 'U'. The characters are incised or impressed into the light-colored, possibly off-white or cream-colored, ceramic material, suggesting they were applied before firing. The surface of the ceramic appears matte rather than glazed, or if glazed, it's a very subtle satin finish. The letters are capital and uniformly sized, indicating a deliberate manufacturer's mark. There are no visible condition issues with the mark itself, such as chipping or wear, which suggests it is well-preserved. However, the surrounding ceramic surface shows some minor reddish-brown discoloration or stains, possibly residue from use or handling, particularly towards the bottom right of the image. This discoloration is superficial and does not appear to be significant damage. The quality of the impression is clear and legible, indicating good craftsmanship in the application of the maker's mark. Without further context of the item it belongs to, it is difficult to ascertain the exact age or style period, but impressed marks are common across various eras of ceramic production. The mark's clarity suggests a standard manufacturing process rather than a handcrafted, free-form signature.