I can't find anything much about the stone under discussion.

Apparently, it's from Priene, Turky -

<< Theatres are common in many ancient cities in Asia Minor and a lot of them can be mentioned in Anatolia. The theatre of Priene is the only preserved one in western Asia Minor which was not lavishly overbuilt in the Roman period but, with its low stage house, has preserved its Hellenistic state. >>

[whc.unesco.org]

[en.wikipedia.org]

[www.tumblr.com]

[ancienttheatrearchive.com]

[turkisharchaeonews.net]

Hermione
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