I can't find a clear reference to this rose that predates the 1950's; the 1827 and 1832 references merely mention a rose from Ispahan, with no classification or description given. It may even be that these references to la rose d'Ispahan refer to R. moschata:

"Olivier, who travelled in the first six years of the French republic, mentions a rose-tree, at Ispahan, called the "Chinese Rose Tree", fifteen feet high, formed by the union of several stems, each four or five inches in diameter. Seeds from this tree were sent to Paris, and produced the common Musk Rose."

from Thomas Rivers' 'Rose Amateur's Guide', 1840, p.158

If these references do 'belong' to the rose (or roses) called 'Ispahan' today, the complete lack of mention of any rose called 'Ispahan' (or 'Pompon des Princes') from those early mentions until the mid-20th century is baffling.

Virginia

Edited to add that the following reference, which seems to refer to R. moschata, as referenced above, is listed in the references section for the Centifolia 'Ispahan'. It clearly says that the rose came from Ispahan, and was a single flowered rose:


"Rapport sur les Rosiers d'Europe de l'herbier de Linné" par M. J-G. Baker... (notes de septembre 1864)...
R. centifolia L. ...Aucher-Eloy, no. 4486 [Theodor Kotschy, "Plantae Perse bor"., 1843], a distribué un rosier venant d'Ispahan, à fleurs presque simple, mais rien ne dit s'il est pris dans les cultures ou à l'état sauvage. M. Boissier, dans sa flore d'Orient, ne fait aucune mention de ce no. d'Aucher-Eloy."