It was built by RS Guitarworks, as a custom replica build of Berry's first and last remaining Tractor bass. He had two Tractors: a natural '66 with dots and binding, then a sunburst '69 with blocks and binding. Towards the end, he took the '69 neck and put in on the natural '66 body. That's the only one left today, in his son's possession. So they recreated that one themselves, right down to the exact wear patterns on the bass itself (thus the wear on the bridge body contour).
The original, as seen here in his son's possession:
