Two Gruen Quadrons with Different 157 Movements

These are two identical Quadron models (I think)
Look carefully at the Caliber 157 movements in each
They are designed differently, serial number in different location
Quadrons 015 : Quadrons Quadrons 016 : Quadrons Quadrons 001 : Quadrons Quadrons 002 : Quadrons
Quadrons 003 : Quadrons Quadrons 004 : Quadrons Quadrons 005 : Quadrons Quadrons 006 : Quadrons
Quadrons 007 : Quadrons Quadrons 011 : Quadrons Quadrons 008 : Quadrons Quadrons 009 : Quadrons
Quadrons 010 : Quadrons Quadrons 012 : Quadrons Quadrons 013 : Quadrons Quadrons 014 : Quadrons