Dimensions: Diam. 3 cm (1 3/16 in)
That's small!
The inscription reads right to left on all three lines. Starting with the bottom line the hieroglyphs translate as follows:
Duck: biliteral sign sA ("son")
Red crown of northern/lower Egypt: uniliteral sign n (preposition "of")
Reed leaf: uniliteral sign i
Senet game board: biliteral sign mn
Water squiggle: uniliteral sign n (phonetic complement, simply reinforces the reading of mn)
Seated man: determinative (word classifier, not read aloud)Put together, you get his name sA-n-Imn, or Sienamun as the Met calls him. Translated literally, "son of (the god) Amun."
The first two lines note that Sienamun was not only a priest (Hm-nTr) but also an overseer of horses (imy-r smsmw).