of triangular form, carved on two faces one with two cherubs holding up a trophy of arms, the other with a mermaid supporting baskets of fruit

This relief is in good condition however there are chips to the edges and a missing section on the top left side (see catalogue photo). Otherwise there is general wear and and chips consistent with age.
"In response to your inquiry, we are pleased to provide you with a general report of the condition of the property described above. Since we are not professional conservators or restorers, we urge you to consult with a restorer or conservator of your choice who will be better able to provide a detailed, professional report. Prospective buyers should inspect each lot to satisfy themselves as to condition and must understand that any statement made by Sotheby's is merely a subjective, qualified opinion. Prospective buyers should also refer to any Important Notices regarding this sale, which are printed in the Sale Catalogue.
NOTWITHSTANDING THIS REPORT OR ANY DISCUSSIONS CONCERNING A LOT, ALL LOTS ARE OFFERED AND SOLD AS IS" IN ACCORDANCE WITH THE CONDITIONS OF BUSINESS PRINTED IN THE SALE CATALOGUE."

This pilaster would have once formed part of an architectural ensemble, possibly from a balustrade.  Compare with two pilasters in the Museo Civico, Turin attributed to a Tuscan workshop of the late 15th to early 16th century  as well as two in the Louvre from a chimney piece

RELATED LITERATURE
L. Mallé, Le sculture del museo d'arte antica (Museo Civico di Torino, 1965) figs. 142 a, b; Les Sculptures européennes du Musée du Louvre (Paris, 2006) p. 235