I don't know where the cabs were originally built. Likely in Europe. The horns were USA built, I assume.

The mods were done in Paris at #1 Boulevard Ney, the old offices of the Nouvelle Revue du Son. Circa 1986. There was a funky concrete storage room beside the loading dock near the giant rolls of newsprint were I did the work. Just me, some Nantex plywood, a few tools and some tar.