However, if they included glyphs for 0, 1-9, 10-90 and 100 the die could conceivably function as a d200 by rolling it twice and adding the results. IF the die represents numbers, the glyphs for 2, 5, 7, 8, 9 are visible in the photo, as well as those for 10, 20 and 100.

The main problem with that or any numerical interpretation of the die is two of its glyphs (the one between beta, epsilon and theta on the center left and between theta, iota and rho on the upper right) do not look Greek, at least to me. The latter COULD conceivably be the digammma glyph for 6. Wikipedia says that, as a letter, it is designated "wau" with uppercase form F, but had disappeared from most Greek dialects by Ptolemaic times, and remained ONLY to represent 6, in a form now known as "stigma" because its lowercase glyph so resembles a sigma-tau combination they became conflated during the Byzantine era. Uppercase stigma appears to simply be the lowercase writ large, but (if I understood all this correctly) ϛ rather than F would not have been used until the Medieval era.

Alternatively, Ptolemaic Egyptians might have retained the old hieratic symbol for 10, a simple arch (which would fit the orientation better; if the die used ϛ it is turned 90°) but the problem there is that it iota represents 10 in Greek and is clearly visible adjacent to theta on the die. Frankly, I have no idea how they used the die.