A: Womb with a seven-bitted key below it, fallopian tubes visible.
B: Greek inscription in three lines: ορωριου|θθαλβου|θαλβαα → ορωριουθ and unidentified vox (R. Merkelbach: variants of Ἀβλαναθαναλβα-palindrome?).
Bibliography
Philipp, Mira et Magica on CBd-2136
Michel, DMG, 54.1.b_9.
Images
Cast of CBd-2136 obverse and reverse in the Gem Impressions Collection of Cornell University Library