Sebastian

◾The 3750.50.00 is powered by Caliber 1861 and has a plexi glass (hesalite) front and a closed back. This reference was replaced by the 311.30.42.30.01.005 as presented during BaselWorld 2014 in July 2014.
◾The 3753.50.00 on the other hand, is powered by Caliber 1863 and has both a sapphire glass on the front as well as on back. This reference was replaced by the 311.30.42.30.01.006 as presented during BaselWorld 2014 in July 2014.
http://www.speedywatches.com/buyers-.../3570-vs-3573/

Wie die mit Plexi vorne und Saphir hinten heisst faellt mir gerade leider nicht ein