Framus introduced the Triumph Bass in 1956 and it was made until the company folded in the late 1970s. Since the start in 1982, the Warwick Co (founded by H P Wilfer, son of Framus founder Fred Wilfer) has also offered a Triumph bass, although modernized.
Triumph Basses are fairly common, as EUBs go. They´ve been made in four-figure numbers.
They all have magnetic pickups, not piezos, which makes the sound closer to a big fretless bass than an acoustic double bass.
Here´s some info on the Triumph Bass:
http://jazzgitarren.k-server.org/framus.html
Mikael