All things considered, I am inclining to think that the rose currently in commerce as the violet-rose colored 'Enchanter'/'Enchantress' is in actuality the -1837 China/Tea 'Abbé Mioland' (which was still around as such as late as 1927, and so could be a "foundling" 50 years later). The form, growth, and general behavior of the present rose is such as we might expect from a Tea or China rose of the 1830s-1840s, and is not in any way, shape, or form that of what would be accepted in 1903 as a Hybrid Tea, least of all by anyone in the florist trade.

Who precisely was Duchess of Brabant in the late 1860s, when a good handful of plants were named after her? The Duchess that had been became queen in 1865 when husband Leopold, Duke of Brabant, became King of the Belgians. Their son who became Duke of Brabant at that time was very young, was unmarried, and died in 1869. Or are we to assume that everything named 'Duchesse de Brabant' dated back to pre-1865?

Perhaps it would be of interest for me to add: The Duchess was being commemorated rather frequently in the mid to late 1860s: 1864 brought us introduction of a bicolor Carnation of the name. In 1867, we find mention of a Strawberry named ‘Duchess de Brabant’; and Achimenes ‘Duchesse de Brabant’ in the same year; a Pear, a Rhododendron, a Begonia as well, and methinks I ran across a Lilac of the name too in the era. 1869 brought us a Pyrethrum ‘Duchess of Brabant’, from Salter of Hammersmith. It seems to have been a time ripe for Horticulture interesting itself in a Duchesse de Brabant.