The two glasses used were described by Monckhoven ( 1867, quoted in Lens VM) as:


Crown no. 2 refractive index 1.52; dispersive power 0.04 and
Light Flint no.1 refractiveindex 1.57; dispersive power 0.0473.

These match with the Dioptrique figures.

These were standard products from Chance Brothers, for decades, so perhaps discarded glass could be used as a source?