I think the bridge on Ilan's pic has holes in de back to feed the string through.
The plastic knob one is '60 or '61. I have the aluminium knob one from '63, with a different bridge. I'm sure it's original, cos it looks a lot like the bridge on the '64 Vista Sonic Bass I used to have.
One problem with tha one, same wit my Gretsch Billy Bo: the saddles are wheels on a thread, so if you feed the string over the saddle, while tuning, the wheel turns and it messes up your string spacing.