Amanico,
Thanks a lot for this very very extensive overview of the memovox saga. You're so close of gathering all relevant information for a specific opus on Memovox that it would be a pity not to publish...
My modest contribution, for the funky period of memovox : reference E 873, which does not appear in this list.
Egg shape SS case, similar to E861, but with cal.916. I guess that this back with GT logo (matching the alarm indicator on the inner-dial) and speedbeat indication (almost erased) is genuine.
At least two other versions did exist :
Yellow gold brushed case with brownish dial (no cridet for the pic, sorry):
and more "classical" version in blue and white tones (similar to E861, but still different...) :
sorry, no credit for picture.
I hope this can help for the reference post on memovoxes. Thanks, once more, for all your efforts in gathering all information.
best,
karmin