A new wave of interest in Mlle. Cottin's novels may have been sparked by, or represented by, another edition of her collected works in 1838. Another of her novels was "Malvina," and--while there was a handful of roses named 'Malvina' already by 1838, I do see the Vibert/V. Verdier Moss of that name coming out in 1841, and a -1845 Alba of that name. It thus could be that this 'Amélie de Mansfield' was another in this little ca. 1840 spate of Cottin-related roses. The original novel, published December 1802 or very near that ("1802" is on the title page), was "Amélie Mansfield," without the "de." But so soon as 1803 it was being referred to with the "de" in there, and later a drama from it with the "de" included came out. If you please, I'd suggest rejecting the -1823 introduction date in your listings, as I find no sign of the rose in question being around so early.