: Hi, as explained more thoroughly in the Cal 11 post pointed at by
: Mark, in that period Lemania was a part shareholder of the Heuer
: company.
: A number of watches - especially chronographs - of that period in
: fact housed Lemania 5100 movements - either completely or
: derived: both the PVD and stainless steel Carrera's, the
: 510.50x, the Silverstone, the Cortina, Audi Sport, AMI etc. A
: kind of in-house movement as it were, though not strictly
: speaking.
: For a number of them, most likely including the 510.523, it looks
: like Lemania also may have provided at least some blueprint of
: the case design, as others that are very similar can be found in
: other brands, which would have been unlikely had this been a
: true proprietary Heuer design.
: Cheers,
: Fabrizio

Thanks for that info, Fabrizio!