According to the Dutch Conam site this Panhard was the very last car bodied by Van Rijswijk. The car is dated 1950.
Check:
http://www.conam.info/van_rijswijk.htmThe chassis number is not X86, but this was the model name of the specific Dyna chassis that was used.
Series production was intended, but they could not make it cost-effective, so this car remained a one-off.