Gruen Quadron Stamped Quadron

A White Gold Gruen Quadron
Caliber 157 Fifteen Jewels
Case is Stamped with QUADRON (very unusual)
Gruen Quadron 007 Gruen Quadron 003 : Gruen Quadron Gruen Quadron 001 : Gruen Quadron Gruen Quadron 004 : Gruen Quadron
Gruen Quadron 005 : Gruen Quadron Gruen Quadron 006 : Gruen Quadron Gruen Quadron 007 : Gruen Quadron