J&C did sell rebranded Chinese film but as Pro 100 not sure if there was a faster version. They made a big blunder on the order as they had the film cut to the exact sizes 5x4, 7x5, 10x8 etc and as a consequence it didn't fit most DDS film holders. Ilford made the same mistake when sending out their first test batch of Harman Direct Positive paper.
Film sizes are nominally based non the plate sizes, however film was used in sheaths in plate holders initially, so needed to be cut slightly smaller. J&C had a lot of unhappy customers.
This was the Chinese J&C film.
Classic Pan was the name used by Fotoimpex for their re-branded Forte films, and J&C were their US distributor. The Forte factory was set up by Kodak Ltd (UK) and made Pan X , Plus X, Super XX, and Tri X, until Germany invaded Hungary, it was then under Agfa control.
Ian