I have worked on three U60 in my life time. They all had center-terminated variations on the theme depicted: These were the (K67) capsule, with final backplate dimensions and diaphragms, but with prototype variations in assembly and mounting hardware.
The mount looks authentic to me:
The ganged, two-wire strapping that is used as capsule holder was common to all of them, until the closed-loop nickel-plated brass ring was introduced, with the first genuine U67s. That first series of closed-loop mounts had threads for three tiny set screws-the capsule was held in place in a similar fashion as M7 capsules.
Only around late 1960/early 1961 would the final mounting set up be introduced which remained in place throughout the original U67 run: four slot screws attach the capsule to the mounting ring via threads cut into the backplates.