The bases, if not original, are certainly close to it. The one with Louis XVI's portrait and the legend "cherished by all" predates the monarch's death in 1793. Marin exhibited comparable groups at the Salons of 1793 and 1795.
Signature: At back on the rock: Marin
Marquis de Bailleul (to his daughter) ; his daughter, Comtesse de la Potterie ; [ sale, Sotheby's, London , July 3, 1959, no. 65; to Rosenberg ] ; Rosenberg (from 1959) ; Charles and Jayne Wrightsman , New York (until 1983; to MMA)