I am a big fan of these seats (I have some of these too, of course).
The picture at the 1st page is not clear, but for me these are Bride Zeta 1 seats (not Zeta 2). The Zeta 1 is harder to find in perfect condition these days. Most of them are damaged and in bad shape.
These are very good seats, and also very nice (at least for me).
Also, the stickers he posted are genuine.
I know of some US seller who made replica of these seats years ago, but was like an hybrid between the Zeta 1 and Zeta 2. the result was not an exact replica, but more like a similar seat with some touches of both.
I am not aware of anybody that makes replicas of these old seats now, mostly because modern design Bride seats have more demand than older ones.