Per P-H Pont's Goerz chronology, 1923. It has been remounted, the Compur Rapid shutter was made from 1934-51. There's no telling where the cells came from. B&J probably wasn't involved.

If the glass is in good order and it forms a decent image on the GG (you'll use a 2x3 camera, won't you?) and you don't already have a good lens around that focal length it might be worth spending the money. If you want to use it on 5x7, save your money and get a modern lens that covers the format well.