Signature: Signed on miniature at lower left, in black: Isabey
Marking:  JEB within a diamond (maker's mark);  child's head and numeral 2 (Paris mark for 2nd standard gold, in use 1797);  cock and 2 in oval (Paris mark for 2nd standard gold, 1798–1809);  bearded head and 85 in circle (Paris medium excise mark for gold and silver, 1798–1809).
Location of marks:
,  inside rim and bottom of box
,  outside on rim of box
Catherine D. Wentworth (until 1948; to MMA)