There were several, indeed.
This one, with the Cal 914, a manual version ( with the Cal 918 rotor which was removed ) from 1996 to 2002:
36 mm case. Black or silver dial.
Or this one, which was re introduced in the catalog in 2010, and still in production:
Please note that I took pictures of the Prototype in stainless steel, and that the definitve dial came with the name Memovox instead of Reveil, like on the rose gold version.
The case of the current Memovox is bigger ( 40 mm versus 38, 7 mm for the Master Reveil ), the bezel has been redesigned, the movement is the modern Cal 956, not the Cal 918, with a quick setting of the date ( much better than the need to go forward and backward from 9 PM to 3 AM to change the date! ), the shape of the hands, and, of course, the name, as already mentionned.
Best,
Nicolas