This is something I can honestly say I have never seen before. Antiquariat Peter Kiefer, Buch und Kunstauktionen, Pforzheim, DE has recently listed this oddity in their current auction catalog. I do not recall ever seeing a male and female academic nude executed in low-relief in a painted plaster medium before. According to the auction house, this group of reliefs dates from around 1800. I am guessing they were used in art instruction. (?) Interesting, none the less.
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