for the 25th anniversary there has been 25 tourbillons (price in Germany was 125.000 Meutsche Mark - not Euro) and
also 25 Quantieme Perpetuel Royal Oak (Mateial steel with platin and dial in tyscani blue). Perhabs other 25 limited models (I don´t know).
Aloso specially for the for the 20th anniversary AP launghed the foundation "Time for the trees".
Regards
Stephan
there was the "city of sails" . A Royal oak chronograph ( but no offshore-modell)
Regards
Stephan