Two other casts of this model, both not gilt and seemingly unfinished, are in the Capodimonte Museum, Naples and one was once in the Ashmolean Museum, Oxford, according to Bode (op.cit.
). The present gilt cast is fully chased and tooled and seems to be one of the finer examples of the model. The variant with the younger, kneeling, rather than the older standing, man bearing the shell has also consistently been attributed to Campagna based on his use of kneeling supporters such as the angels supporting the altar of the Sacrament in S. Giuliano or the pair of angels carrying cornucopia candlesticks now on an altar of the church of the Carmini, Venice. An example of this variant model is in the Victoria and Albert Museum, London (inv. no
W. Bode, The Italian bronze statuettes of the renaissance, rev. ed. by James D. Draper, 1980, pl. CLXXI; N. Penny, Catalogue of European Sculpture in the Ashmolean Museum, vol.1 Italian, Oxford 1992, nos. 243 and 244; L. Ambrusio and F. Capobianco (eds.), La Collezione Farnese di Capodimonte, I Bronzetti, Naples 1995, no. 26